SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  Schedule 13D

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 16)*

                            CompX International Inc.
                                (Name of Issuer)

                 Class A Common Stock, par value $0.01 per share
                         (Title of Class of Securities)

                                   20563P 10 1
                                 (CUSIP Number)

                                STEVEN L. WATSON
                              THREE LINCOLN CENTRE
                                   SUITE 1700
                                5430 LBJ FREEWAY
                            DALLAS, TEXAS 75240-2694
                                 (972) 233-1700
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                  May 11, 2006
                      (Date of Event which requires Filing
                               of this Statement)

         If the filing person has  previously  filed a statement on Schedule 13G
to report the  acquisition  that is the  subject of this  Schedule  13D,  and is
filing  this  schedule  because  of  sections   240.13d-1(e),   240.13d-1(f)  or
240.13d-1(g), check the following box. [ ]

         *The  remainder  of this cover page shall be filled out for a reporting
person's  initial  filing on this  form with  respect  to the  subject  class of
securities,  and for any subsequent amendment containing information which would
alter disclosures provided in a prior cover page.

         The information  required on the remainder of this cover page shall not
be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise  subject to the  liabilities of that section of
the Act but shall be subject to all other  provisions of the Act  (however,  see
the Notes).

                         (Continued on following pages)






CUSIP No.  20563P 10 1

     1       NAME OF REPORTING PERSON
             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                      CompX Group, Inc.

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [   ]

             (b)  [   ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      OO

     5       CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
             PURSUANT TO ITEMS 2(d) OR 2(e)  [  ]


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Delaware

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     2,586,820
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      2,586,820

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      2,586,820

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

    13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                      49.4%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO






CUSIP No.  20563P 10 1

     1       NAME OF REPORTING PERSON
             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                      NL Industries, Inc.

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [   ]

             (b)  [   ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      WC

     5       CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
             PURSUANT TO ITEMS 2(d) OR 2(e)  [  ]


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      New Jersey

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     2,922,024
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      2,922,024

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      2,922,024

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

    13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                      55.8%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO






CUSIP No.  20563P 10 1

     1       NAME OF REPORTING PERSON
             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                      TIMET Finance Management Company

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [   ]

             (b)  [   ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      WC

     5       CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
             PURSUANT TO ITEMS 2(d) OR 2(e)  [  ]


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Delaware

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     3,070,420
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      3,070,420

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      3,070,420

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

    13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                      58.6%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO






CUSIP No.  20563P 10 1

     1       NAME OF REPORTING PERSON
             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                      Titanium Metals Corporation

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [   ]

             (b)  [   ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      WC

     5       CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
             PURSUANT TO ITEMS 2(d) OR 2(e)  [  ]


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Delaware

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     3,070,420
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      3,070,420

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      3,070,420

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

    13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                      58.6%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO






CUSIP No.  20563P 10 1

     1       NAME OF REPORTING PERSON
             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                      Tremont LLC

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [   ]

             (b)  [   ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not applicable

     5       CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
             PURSUANT TO ITEMS 2(d) OR 2(e)  [  ]


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Delaware

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     3,070,420
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      3,070,420

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      3,070,420

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

    13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                      58.6%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      OO






CUSIP No.  20563P 10 1

     1       NAME OF REPORTING PERSON
             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                      Valhi, Inc.

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [   ]

             (b)  [   ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      WC

     5       CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
             PURSUANT TO ITEMS 2(d) OR 2(e)  [  ]


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Delaware

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     3,405,624
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      3,405,624

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      3,405,624

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

    13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                      65.0%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO






CUSIP No.  20563P 10 1

     1       NAME OF REPORTING PERSON
             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                      Valhi Holding Company

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [   ]

             (b)  [   ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not applicable

     5       CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
             PURSUANT TO ITEMS 2(d) OR 2(e)  [  ]


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Delaware

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     3,405,624
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      3,405,624

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      3,405,624

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

    13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                      65.0%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO






CUSIP No.  20563P 10 1

     1       NAME OF REPORTING PERSON
             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                      Valhi Group, Inc.

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [   ]

             (b)  [   ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not applicable

     5       CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
             PURSUANT TO ITEMS 2(d) OR 2(e)  [  ]


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Nevada

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     3,405,624
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      3,405,624

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      3,405,624

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

    13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                      65.0%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO






CUSIP No.  20563P 10 1

     1       NAME OF REPORTING PERSON
             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                      National City Lines, Inc.

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [   ]

             (b)  [   ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not applicable

     5       CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
             PURSUANT TO ITEMS 2(d) OR 2(e)  [  ]


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Delaware

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     3,405,624
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      3,405,624

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      3,405,624

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

    13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                      65.0%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO






CUSIP No.  20563P 10 1

     1       NAME OF REPORTING PERSON
             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                      NOA, Inc.

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [   ]

             (b)  [   ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not applicable

     5       CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
             PURSUANT TO ITEMS 2(d) OR 2(e)  [  ]


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Texas

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     3,405,624
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      3,405,624

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      3,405,624

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

    13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                      65.0%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO






CUSIP No.  20563P 10 1

     1       NAME OF REPORTING PERSON
             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                      Dixie Holding Company

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [   ]

             (b)  [   ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not applicable

     5       CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
             PURSUANT TO ITEMS 2(d) OR 2(e)  [  ]


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Delaware

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     3,405,624
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      3,405,624

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      3,405,624

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

    13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                      65.0%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO






CUSIP No.  20563P 10 1

     1       NAME OF REPORTING PERSON
             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                      Dixie Rice Agricultural Corporation, Inc.

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [   ]

             (b)  [   ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not applicable

     5       CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
             PURSUANT TO ITEMS 2(d) OR 2(e)  [  ]


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Louisiana

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     3,405,624
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      3,405,624

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      3,405,624

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

    13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                      65.0%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO






CUSIP No.  20563P 10 1

     1       NAME OF REPORTING PERSON
             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                      Southwest Louisiana Land Company, Inc.

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [   ]

             (b)  [   ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not applicable

     5       CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
             PURSUANT TO ITEMS 2(d) OR 2(e)  [  ]


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Louisiana

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     3,405,624
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      3,405,624

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      3,405,624

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

    13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                      65.0%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO






CUSIP No.  20563P 10 1

     1       NAME OF REPORTING PERSON
             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                      Contran Corporation

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [   ]

             (b)  [   ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not applicable

     5       CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
             PURSUANT TO ITEMS 2(d) OR 2(e)  [  ]


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Delaware

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     3,405,624
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      3,405,624

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      3,405,624

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

    13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                      65.0%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO






CUSIP No.  20563P 10 1

     1       NAME OF REPORTING PERSON
             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                      The Combined Master Retirement Trust

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [   ]

             (b)  [   ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not applicable

     5       CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
             PURSUANT TO ITEMS 2(d) OR 2(e)  [  ]


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Texas

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     3,405,624
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      3,405,624

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      3,405,624

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

    13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                      65.0%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      EP






CUSIP No.  20563P 10 1

     1       NAME OF REPORTING PERSON
             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                      Harold Simmons Foundation, Inc.

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [   ]

             (b)  [   ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not applicable

     5       CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
             PURSUANT TO ITEMS 2(d) OR 2(e)  [  ]


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Texas

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     3,405,624
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      3,405,624

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      3,405,624

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

    13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                      65.0%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO






CUSIP No.  20563P 10 1

     1       NAME OF REPORTING PERSON
             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                      Harold C. Simmons

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP(SEE INSTRUCTIONS)

             (a)  [   ]

             (b)  [   ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not applicable

     5       CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
             PURSUANT TO ITEMS 2(d) OR 2(e)  [  ]


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      USA

                               7      SOLE VOTING POWER

                                                         56,900
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     3,425,624
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                          56,900

                               10     SHARED DISPOSITIVE POWER

                                                      3,425,624

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      56,900

    12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [ X ]

    13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                      1.1%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      IN






                                AMENDMENT NO. 16
                                 TO SCHEDULE 13D

         This amended  statement on Schedule 13D (this  "Statement")  relates to
the class A common stock,  par value $0.01 per share (the "Class A Shares"),  of
CompX International Inc., a Delaware corporation (the "Company").  Items 2, 3, 4
and 5 of this Statement are hereby amended as set forth below.

Item 2.  Identity and Background.

         Item 2(a) is amended and restated as follows.

         (a) The following entities or person are filing this Statement
(collectively, the "Reporting Persons"):

                  (i) CompX Group,  Inc.  ("CGI") as a direct  holder of Class A
         Shares;

                  (ii) NL Industries,  Inc. ("NL") and TIMET Finance  Management
         Company  ("TFMC")  by virtue of their  direct  ownership  of CGI and as
         direct holders of Class A Shares;

                  (iii) Titanium Metals  Corporation  ("TIMET") by virtue of its
         indirect ownership of CGI and direct ownership of TFMC;

                  (iv)  Tremont  LLC  ("Tremont")  by  virtue  of  its  indirect
         ownership of CGI and TFMC;

                  (v) Valhi,  Inc.  ("Valhi"),  Valhi Holding  Company  ("VHC"),
         Valhi Group, Inc. ("VGI"), National City Lines, Inc. ("National"), NOA,
         Inc.  ("NOA"),  Dixie Holding  Company  ("Dixie  Holding"),  Dixie Rice
         Agricultural Corporation, Inc. ("Dixie Rice"), Southwest Louisiana Land
         Company,  Inc.  ("Southwest"),  Contran  Corporation  ("Contran"),  The
         Combined  Master  Retirement  Trust (the "CMRT") and the Harold Simmons
         Foundation,  Inc.  (the  "Foundation")  by  virtue  of  their  indirect
         ownership of CGI, TFMC and NL; and

                  (vi)  Harold C.  Simmons by virtue of his direct and  indirect
         ownership of Class A Shares and his positions  with Contran and certain
         of the other entities (as described in this Statement).

By signing this Statement,  each Reporting  Person agrees that this Statement is
filed on its or his behalf.

         CGI,  TFMC,  NL, Harold C. Simmons and his spouse are direct holders of
49.4%, 9.2%, 6.4%, 1.1% and 0.4%, respectively,  of the 5,240,280 Class A Shares
outstanding  as of June 1, 2006 according to  information  the Company  provided
(the "Outstanding Class A Shares").

         CGI also directly  holds 100%, or 10,000,000  shares,  of the Company's
class B common  stock,  par  value  $0.01 per share  (the  "Class B Shares"  and
collectively with the Class A Shares shall be referred to as the "Shares").  The
description of the relative  rights of the Shares as described in this Statement
is qualified in its entirety by the terms of the Company's restated  certificate
of  incorporation  that is  filed  as  Exhibit  3.1 to  Amendment  No.  1 to the
Company's  Registration Statement on Form S-1 filed with the U.S. Securities and
Exchange  Commission  on  February  4,  1998  (Reg.  No.  333-42643),  which  is
incorporated  herein by reference.  As a result of its ownership of 49.4% of the
Class A Shares and 100% of the Class B Shares, CGI directly holds  approximately
82.6% of the  combined  voting power (97.5% of the voting power for the election
of directors)  of all classes of voting stock of the Company.  CGI may be deemed
to control the Company.

         NL and TFMC are the direct holders of  approximately  82.4%, and 17.6%,
respectively,  of the outstanding shares of CGI common stock and together may be
deemed to control CGI.  Valhi and TFMC are the direct  holders of  approximately
83.1% and 0.5%,  respectively,  of the outstanding shares of NL common stock and
together may be deemed to control NL.

         TIMET is the direct holder of 100% of the outstanding  shares of common
stock of TFMC and may be deemed to control  TFMC.  Tremont,  Harold C.  Simmons'
spouse,  the CMRT,  Valhi and  Harold  C.  Simmons  are the  direct  holders  of
approximately  33.3%,  12.4%,  10.2%, 3.9% and 2.8% of the outstanding shares of
TIMET common stock. Tremont may be deemed to control TIMET. The ownership of Mr.
Simmons'  spouse includes  21,333,333  shares of TIMET common stock that she has
the right to  acquire  upon  conversion  of  1,600,000  shares of TIMET's 6 3/4%
Series A Convertible  Preferred  Stock, par value $0.01 per share (the "Series A
Preferred  Stock"),  that she directly  owns.  The  ownership of Valhi  includes
196,000  shares of TIMET  common  stock that Valhi has the right to acquire upon
conversion  of 14,700  shares of Series A  Preferred  Stock that Valhi  directly
holds.  The  percentage  ownership  of TIMET  common  stock  held by each of Ms.
Simmons  and Valhi  assumes the full  conversion  of only the shares of Series A
Preferred  Stock she or Valhi owns,  respectively.  All share  amounts for TIMET
common stock in this amendment no. 16 to this Statement  reflect the two-for-one
split of the Shares that TIMET paid in the form of a stock dividend on the close
of  business on May 15, 2006 to holders of record as of the close of business on
May 5, 2006.

         Valhi is the sole  member  of  Tremont  and may be  deemed  to  control
Tremont. VHC, the Foundation, the Contran Deferred Compensation Trust No. 2 (the
"CDCT No. 2") and the CMRT are the direct holders of 91.8%, 0.9%, 0.4% and 0.1%,
respectively,  of the common stock of Valhi. VHC may be deemed to control Valhi.
VGI,  National,  and  Contran are the direct  holders of 87.4%,  10.3% and 2.3%,
respectively,  of the outstanding common stock of VHC. Together,  VGI, National,
and Contran may be deemed to control VHC.  National,  NOA and Dixie  Holding are
the direct holders of approximately 73.3%, 11.4% and 15.3%, respectively, of the
outstanding  shares of common stock of VGI.  Together,  National,  NOA and Dixie
Holding may be deemed to control VGI.  Contran and NOA are the direct holders of
approximately 85.7% and 14.3%, respectively, of the outstanding shares of common
stock of National and together  may be deemed to control  National.  Contran and
Southwest are the direct holders of approximately 49.9% and 50.1%, respectively,
of the  outstanding  shares of common stock of NOA and together may be deemed to
control NOA. Dixie Rice is the direct holder of 100% of the  outstanding  shares
of common  stock of Dixie  Holding and may be deemed to control  Dixie  Holding.
Contran is the holder of 100% of the outstanding shares of common stock of Dixie
Rice  and may be  deemed  to  control  Dixie  Rice.  Contran  is the  holder  of
approximately  88.9% of the outstanding  shares of common stock of Southwest and
may be deemed to control Southwest.

         Substantially  all of  Contran's  outstanding  voting  stock is held by
trusts  established  for the benefit of certain  children and  grandchildren  of
Harold C. Simmons (the "Trusts"),  of which Mr. Simmons is the sole trustee,  or
held by Mr. Simmons or persons or other entities related to Mr. Simmons. As sole
trustee  of the  Trusts,  Mr.  Simmons  has the  power  to vote and  direct  the
disposition  of the shares of Contran  stock held by the  Trusts.  Mr.  Simmons,
however,  disclaims beneficial ownership of any shares of Contran stock that the
Trusts hold.

         The Foundation  directly holds  approximately  0.9% of the  outstanding
shares  of  Valhi  common  stock.  The  Foundation  is a  tax-exempt  foundation
organized  for  charitable  purposes.  Harold C.  Simmons is the chairman of the
board of the Foundation and may be deemed to control the Foundation.

         The CDCT No. 2 directly  holds  approximately  0.4% of the  outstanding
shares of Valhi common  stock.  U.S.  Bank  National  Association  serves as the
trustee of the CDCT No. 2. Contran  established the CDCT No. 2 as an irrevocable
"rabbi  trust"  to assist  Contran  in  meeting  certain  deferred  compensation
obligations  that it owes to Harold  C.  Simmons.  If the CDCT No. 2 assets  are
insufficient  to satisfy such  obligations,  Contran is obligated to satisfy the
balance of such obligations as they come due.  Pursuant to the terms of the CDCT
No. 2,  Contran (i) retains the power to vote the shares of Valhi  common  stock
held directly by the CDCT No. 2, (ii) retains dispositive power over such shares
and (iii) may be deemed the indirect beneficial owner of such shares.

         The CMRT directly holds  approximately  10.2% of the outstanding shares
of TIMET common stock and 0.1% of the outstanding  shares of Valhi common stock.
Contran  sponsors the CMRT,  which permits the  collective  investment by master
trusts that  maintain the assets of certain  employee  benefit plans Contran and
related companies adopt. Harold C. Simmons is the sole trustee of the CMRT and a
member of the trust  investment  committee for the CMRT.  Mr.  Simmons is also a
participant in one or more of the employee benefit plans that invest through the
CMRT.

         NL and a subsidiary of NL directly own  3,522,967  shares and 1,186,200
shares,  respectively,  of Valhi common stock.  Pursuant to Delaware law,  Valhi
treats the shares of Valhi common stock that NL and the  subsidiary of NL own as
treasury  stock for voting  purposes and for the purposes of this Statement such
shares are not deemed outstanding.

         Mr.  Harold C.  Simmons is  chairman  of the board and chief  executive
officer of NL and chairman of the board of CGI, TIMET, Tremont, Valhi, VHC, VGI,
National, NOA, Dixie Holding, Dixie Rice, Southwest and Contran.

         By virtue of the holding of the offices,  the stock  ownership  and his
service as trustee,  all as described  above,  (a) Mr.  Simmons may be deemed to
control the  entities  described  above and (b) Mr.  Simmons and certain of such
entities may be deemed to possess  indirect  beneficial  ownership of the Shares
that are directly held by CGI, TFMC and NL. However,  Mr. Simmons disclaims such
beneficial  ownership of the Shares beneficially owned,  directly or indirectly,
by any of such entities.

         Harold C. Simmons' spouse is the direct owner of 20,000 Class A Shares,
128,600  shares  of TIMET  common  stock,  1,600,000  shares  of TIMET  Series A
Preferred  Stock,  239,475  shares of NL common stock and 43,400 shares of Valhi
common stock. Mr. Simmons may be deemed to share indirect  beneficial  ownership
of such securities. He disclaims beneficial ownership of all securities that his
spouse holds directly.

         Harold  C.  Simmons  is the  direct  owner of  56,900  Class A  Shares,
4,167,900  shares of TIMET  common  stock,  447,100  shares  of NL common  stock
(including  stock  options  exerciseable  for 2,000  shares) and 3,383 shares of
Valhi common stock.

         A trust of which Harold C. Simmons and his spouse are  co-trustees  and
the  beneficiaries  of which are the  grandchildren  of his spouse is the direct
holder of 36,500 shares of Valhi common stock. Mr. Simmons disclaims  beneficial
ownership of these shares.

         Certain information  concerning the directors and executive officers of
the Reporting  Persons,  including  offices held by Mr.  Simmons is set forth on
Schedule B attached hereto and incorporated herein by reference.

         The Reporting Persons understand that the funds required by each person
named in Schedule B to this  Statement to acquire Shares were from such person's
personal funds.

Item 3.  Source and Amount of Funds or Other Consideration.

         Item 3 is amended as follows.

         The  total  amount  of funds NL used to  acquire  the Class A Shares NL
purchased as reported in Item 5(c) was $1,187,516.00 (including commissions). NL
obtained such funds from its cash on hand.

Item 4.  Purpose of Transaction.

         Item 4 is amended as follows.

         NL  purchased  the  Class A Shares  reported  in Item  5(c) in order to
increase its equity interest in the Company.

         Depending  upon  their   evaluation  of  the  Company's   business  and
prospects,  and  upon  future  developments  (including,  but  not  limited  to,
performance  of the  Class  A  Shares  in the  market,  availability  of  funds,
alternative  uses of  funds,  and  money,  stock  market  and  general  economic
conditions),  any of the Reporting  Persons or other entities that may be deemed
to be affiliated with Contran may from time to time purchase Shares,  and any of
the Reporting Persons or other entities that may be deemed to be affiliated with
Contran may from time to time  dispose of all or a portion of the Shares held by
such person, or cease buying or selling Shares. Any such additional purchases or
sales of Shares may be in open market or privately  negotiated  transactions  or
otherwise.

         The  information  included  in  Item  2 of  this  Statement  is  hereby
incorporated  herein by reference.  As described under Item 2 of this Statement,
Harold C. Simmons may be deemed to control the Company.

         Certain of the persons  named in Schedule B to this  Statement,  namely
Eugene K.  Anderson,  James W. Brown,  Robert D. Graham,  Tim C. Hafer,  J. Mark
Hollingsworth, Keith A. Johnson, William J. Lindquist, A. Andrew R. Louis, Kelly
D.  Luttmer,  Andrew B. Nace,  Bobby D.  O'Brien,  Glenn R.  Simmons,  Harold C.
Simmons, John A. St. Wrba, Gregory M. Swalwell and Steven L. Watson are officers
and/or directors of the Company or perform services for the Company as employees
of one of the Company's parent  corporations and may acquire Class A Shares from
time to time  pursuant to employee  benefit  plans that the Company  sponsors or
other compensation arrangements with the Company or otherwise.

         Except as described in this Item 4, none of the Reporting  Persons nor,
to the best  knowledge of such persons,  any other person named in Schedule B to
this Statement has  formulated  any plans or proposals  which relate to or would
result in any matter  required to be  disclosed  in response to  paragraphs  (a)
through (j) of Item 4 of Schedule 13D.

Item 5.  Interest in Securities of the Issuer.

         Item 5 is amended as follows.

         (a) CGI,  TFMC,  NL,  Harold C.  Simmons  and his spouse are the direct
beneficial owners of 2,586,820,  483,600,  335,204,  56,900,  and 20,000 Class A
Shares, respectively. CGI also directly holds 10,000,000 Class B Shares.

         By  virtue  of  the  relationships  described  under  Item  2  of  this
Statement:

                  (1)  CGI  may be  deemed  to be the  beneficial  owner  of the
         2,586,820 Class A Shares  (approximately 49.4% of the Outstanding Class
         A Shares) and  10,000,000  Class B Shares  (approximately  82.6% of the
         combined  voting power,  and 97.5% of the voting power for the election
         of  directors,  of all classes of voting stock of the Company) that CGI
         holds directly;

                  (2)  NL may  be  deemed  to be  the  beneficial  owner  of the
         2,922,024 Class A Shares  (approximately 55.8% of the Outstanding Class
         A Shares) and  10,000,000  Class B Shares  (approximately  84.8% of the
         combined  voting power,  and 97.8% of the voting power for the election
         of  directors,  of all classes of voting stock of the Company) that CGI
         and NL hold directly;

                  (3)  TFMC,  TIMET  and  Tremont  may each be  deemed to be the
         beneficial owner of the 3,070,420 Class A Shares  (approximately  58.6%
         of the  Outstanding  Class A  Shares)  and  10,000,000  Class B  Shares
         (approximately  85.8% of the combined  voting  power,  and 97.9% of the
         voting  power for the election of  directors,  of all classes of voting
         stock of the Company) that CGI and TFMC hold directly;

                  (4) Valhi, VHC, VGI, National, NOA, Dixie Holding, Dixie Rice,
         Southwest,  Contran,  the CMRT and the Foundation may each be deemed to
         be the beneficial owner of the 3,405,624 Class A Shares  (approximately
         65.0% of the Outstanding  Class A Shares) and 10,000,000 Class B Shares
         (approximately  88.0% of the combined  voting  power,  and 98.3% of the
         voting  power for the election of  directors,  of all classes of voting
         stock of the Company) that CGI, TFMC and NL hold directly; and

                  (5) Harold C. Simmons may be deemed to be the beneficial owner
         of the 3,482,524 Class A Shares (approximately 66.5% of the Outstanding
         Class A Shares) and 10,000,000 Class B Shares  (approximately  88.5% of
         the  combined  voting  power,  and  98.3% of the  voting  power for the
         election of  directors,  of all classes of voting stock of the Company)
         that CGI, TFMC, NL, he and his spouse hold directly.

Except to the extent of the 56,900 Class A Shares he holds  directly,  Harold C.
Simmons disclaims beneficial ownership of all Shares.

         The Reporting Persons  understand,  based on ownership filings with the
U.S.  Securities and Exchange  Commission (the "Commission") or upon information
provided  by the  persons  listed on  Schedule  B to this  Statement,  that such
persons may be deemed to own  beneficially  the Class A Shares as  indicated  on
Schedule C to this Statement.

         (b) By  virtue  of  the  relationships  described  in  Item  2 of  this
Statement:

                  (1) CGI may be deemed  to share  the power to vote and  direct
         the disposition of the 2,586,820 Class A Shares (approximately 49.4% of
         the  Outstanding   Class  A  Shares)  and  10,000,000  Class  B  Shares
         (approximately  82.6% of the combined  voting  power,  and 97.5% of the
         voting  power for the election of  directors,  of all classes of voting
         stock of the Company) that CGI holds directly;

                  (2) NL may be deemed to share the power to vote and direct the
         disposition of the 2,922,024 Class A Shares (approximately 55.8% of the
         Outstanding   Class  A   Shares)   and   10,000,000   Class  B   Shares
         (approximately  84.8% of the combined  voting  power,  and 97.8% of the
         voting  power for the election of  directors,  of all classes of voting
         stock of the Company) that CGI and NL hold directly;

                  (3) TFMC,  TIMET and  Tremont  may each be deemed to share the
         power to vote and  direct  the  disposition  of the  3,070,420  Class A
         Shares  (approximately  58.6% of the  Outstanding  Class A Shares)  and
         10,000,000 Class B Shares  (approximately  85.8% of the combined voting
         power, and 97.9% of the voting power for the election of directors,  of
         all  classes  of voting  stock of the  Company)  that CGI and TFMC hold
         directly;

                  (4) Valhi, VHC, VGI, National, NOA, Dixie Holding, Dixie Rice,
         Southwest,  Contran,  the CMRT and the Foundation may each be deemed to
         share the power to vote and direct  the  disposition  of the  3,405,624
         Class A Shares  (approximately 65.0% of the Outstanding Class A Shares)
         and  10,000,000  Class B Shares  (approximately  88.0% of the  combined
         voting  power,  and  98.3% of the  voting  power  for the  election  of
         directors,  of all classes of voting  stock of the  Company)  that CGI,
         TFMC and NL hold directly;

                  (5) Harold C. Simmons may be deemed to share the power to vote
         and  direct  the   disposition   of  the   3,425,624   Class  A  Shares
         (approximately  65.4% of the Outstanding Class A Shares) and 10,000,000
         Class B Shares  (approximately  88.1% of the combined voting power, and
         98.3% of the voting power for the election of directors, of all classes
         of voting stock of the Company) that CGI,  TFMC, NL and his spouse hold
         directly; and

                  (6) Harold C.  Simmons may be deemed to have the sole power to
         vote  and  direct  the   disposition  of  the  56,900  Class  A  Shares
         (approximately 1.1% of the Outstanding Class A Shares) that he directly
         holds.

         (c) The  table  below  sets  forth  transactions  in the  Shares by the
Reporting  Persons  since  March 29,  2006,  the last  transaction  reported  in
amendment  no. 15 to this  Statement.  Other than Glenn R. Simmons and Steven L.
Watson,  NL was the only Reporting Person to have  transactions  since March 29,
2006. NL executed all of such  transactions,  which were all purchases of Shares
on the New York Stock Exchange.





                                          Number of                  Price Per Share ($)
             Date                           Shares                (exclusive of commissions)
       ----------------                ---------------         --------------------------------
                                                                     
           04/21/06                              100                          $15.20
           04/21/06                              900                          $15.50
           04/21/06                            1,700                          $15.68
           04/24/06                              200                          $16.00
           04/27/06                            3,600                          $16.00
           04/28/06                            4,900                          $16.00
           05/01/06                            1,100                          $15.75
           05/01/06                              500                          $15.76
           05/01/06                            2,000                          $16.00
           05/02/06                            1,600                          $16.00
           05/04/06                            4,700                          $16.00
           05/05/06                           10,000                          $16.00
           05/08/06                           10,000                          $16.00
           05/08/06                              900                          $15.75
           05/09/06                            9,400                          $15.50
           05/10/06                              300                          $15.50
           05/11/06                            3,400                          $15.50
           05/12/06                            2,800                          $15.50
           05/15/06                            1,300                          $15.50
           05/16/06                            1,600                          $15.50
           05/17/06                            2,200                          $15.50
           05/18/06                            1,800                          $15.50
           05/19/06                            1,000                          $15.50
           05/22/06                            1,400                          $15.50
           05/23/06                            1,500                          $15.50
           05/24/06                              900                          $15.50
           05/30/06                            5,000                          $15.25
           05/31/06                              400                          $15.50


         Mr.  Glenn R.  Simmons and Steven L.  Watson  each  received on May 16,
2006, 1,000 Shares,  which Shares represent the Company's annual grant of Shares
for no cash consideration to the Company's non-employee directors.

         (d) CGI,  TFMC, NL, Harold C. Simmons and his spouse each has the right
to receive and the power to direct the receipt of dividends  from,  and proceeds
from the sale of, the Shares directly held by such entity or person.





                                    Signature

         After reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this Statement is true,  complete and
correct.

Date:  June 7, 2006




                                                          /s/ Harold C. Simmons
                                                          ----------------------
                                                          Harold C. Simmons
                                                          Signing in the
                                                          capacities listed on
                                                          Schedule "A" attached
                                                          hereto and
                                                          incorporated herein by
                                                          reference.





                                    Signature

         After reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this Statement is true,  complete and
correct.

Date:  June 7, 2006





                                                          /s/ Steven L. Watson
                                                          ----------------------
                                                          Steven L. Watson
                                                          Signing in the
                                                          capacities listed on
                                                          Schedule "A" attached
                                                          hereto and
                                                          incorporated herein by
                                                          reference.





                                    Signature

         After reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this Statement is true,  complete and
correct.

Date:  June 7, 2006





                                                         /s/ Gregory M. Swalwell
                                                         -----------------------
                                                         Gregory M. Swalwell
                                                         Signing in the
                                                         capacity listed on
                                                         Schedule "A" attached
                                                         hereto and
                                                         incorporated herein by
                                                         reference.





                                   SCHEDULE A


HAROLD C. SIMMONS, in his individual capacity and as trustee of THE COMBINED
MASTER RETIREMENT TRUST.

STEVEN L. WATSON, as president, chief executive officer or vice president of
each of:

CONTRAN CORPORATION
DIXIE HOLDING COMPANY
DIXIE RICE AGRICULTURAL CORPORATION, INC.
HAROLD SIMMONS FOUNDATION, INC.
NATIONAL CITY LINES, INC.
NOA, INC.
SOUTHWEST LOUISIANA LAND COMPANY, INC.
TITANIUM METALS CORPORATION
TREMONT LLC
VALHI GROUP, INC.
VALHI HOLDING COMPANY
VALHI, INC.

GREGORY M. SWALWELL, as vice president of each of:

COMPX GROUP, INC.
NL INDUSTRIES, INC.
TIMET FINANCE MANAGEMENT COMPANY






                                   Schedule B


         The names of the directors and executive  officers of CompX Group, Inc.
("CGI"),  Contran  Corporation   ("Contran"),   Dixie  Holding  Company  ("Dixie
Holding"), Dixie Rice Agricultural Corporation,  Inc. ("Dixie Rice"), the Harold
Simmons  Foundation,   Inc.  (the  "Foundation"),   National  City  Lines,  Inc.
("National"), NL Industries, Inc. ("NL"), NOA, Inc. ("NOA"), Southwest Louisiana
Land Company,  Inc.  ("Southwest"),  TIMET Finance  Management Company ("TFMC"),
Titanium Metals Corporation ("TIMET"),  Valhi Group, Inc. ("VGI"), Valhi Holding
Company  ("VHC")  and  Valhi,   Inc.   ("Valhi")  and  their  present  principal
occupations are set forth below. Except as otherwise indicated, each such person
is a citizen of the United  States of America and the  business  address of each
such person is 5430 LBJ Freeway, Suite 1700, Dallas, Texas 75240.

           Name                            Present Principal Occupation
-----------------------------      ---------------------------------------------

Eugene K. Anderson                  Vice  president of Contran,  Dixie  Holding,
                                    Dixie  Rice,   National,   NOA,   Southwest,
                                    Tremont   LLC,   a  wholly   owned   limited
                                    liability  company  of  Valhi   ("Tremont"),
                                    Valhi,  VGI and VHC;  and  treasurer  of the
                                    Foundation.

Thomas E. Barry (1)                 Vice  president  for  executive  affairs  at
                                    Southern Methodist  University and professor
                                    of  marketing  in the Edwin L. Cox School of
                                    Business at Southern  Methodist  University;
                                    and a director of Valhi.

James W. Brown                      Vice president, corporate finance of TIMET.

Keith R. Coogan (2)                 Chief   executive    officer   of   Software
                                    Spectrum,    Inc.;    director   of   Kronos
                                    Worldwide,   Inc.,  a  subsidiary  of  Valhi
                                    ("Kronos Worldwide"), and TIMET

Norman S. Edelcup (3)               Mayor  of  Sunny   Isles   Beach,   Florida;
                                    director  of  CompX  International  Inc.,  a
                                    subsidiary of NL (the "Company"),  Valhi and
                                    Florida Savings Bancorp;  and trustee of the
                                    Baron Funds, a mutual fund group.

Lisa Simmons Epstein                Director and president of the Foundation.

Robert D. Graham                    Vice  president of Contran,  Dixie  Holding,
                                    Dixie Rice, the Foundation,  National,  NOA,
                                    Southwest,  Tremont,  Valhi,  VGI  and  VHC;
                                    executive  vice  president  of  TIMET;  vice
                                    president  and  general  counsel  of  Kronos
                                    Worldwide   and  NL;  and  vice   president,
                                    general counsel and secretary of CGI.

Norman N. Green (4)                 A private investor and a director of TIMET.

Tim C. Hafer                        Vice   president  and   controller,   Kronos
                                    Worldwide and NL.

J. Mark Hollingsworth               Vice   president  and  general   counsel  of
                                    Contran,    Dixie   Holding,   Dixie   Rice,
                                    National,  NOA, Southwest,  Tremont,  Valhi,
                                    VGI  and  VHC;   general   counsel   of  the
                                    Foundation and the Company; trust counsel of
                                    The  Combined  Master  Retirement  Trust,  a
                                    trust  Contran  sponsors  that  permits  the
                                    collective  investment by master trusts that
                                    maintain  the  assets  of  certain  employee
                                    benefit plans Contran and related  companies
                                    adopt  (the  "CMRT");   and  acting  general
                                    counsel of Keystone Consolidated Industries,
                                    Inc., a subsidiary of Contran ("Keystone").

Bruce P. Inglis (5)                 Vice president-finance, operations of TIMET.

Francis B. Jacobs, II (6)           Vice  president-client  services  of Stewart
                                    Management  Company;   and  director,   vice
                                    president and assistant secretary of TFMC.

Keith A. Johnson                    Controller of the Foundation.

William J. Lindquist                Director   and  senior  vice   president  of
                                    Contran, Dixie Holding,  National,  NOA, VGI
                                    and  VHC;  senior  vice  president  of Dixie
                                    Rice,  Southwest,  Tremont and Valhi;  and a
                                    director of CGI.

A. Andrew R. Louis                  Secretary  of Contran,  the  Company,  Dixie
                                    Holding,   Dixie  Rice,   Kronos  Worldwide,
                                    National,   NL,  NOA,  Southwest,   Tremont,
                                    TIMET, Valhi, VGI and VHC.

Kelly D. Luttmer                    Vice  president and tax director of Contran,
                                    CGI, the Company, Dixie Holding, Dixie Rice,
                                    Kronos   Worldwide,   National,   NOA,   NL,
                                    Southwest,  TIMET,  Tremont,  Valhi, VGI and
                                    VHC.

Andrew McCollam, Jr. (7)            President   and  a  director  of  Southwest;
                                    director  of  Dixie  Rice;   and  a  private
                                    investor.

W. Hayden McIlroy (8)               Private  investor  primarily in real estate;
                                    and a director  of Valhi and Cadco  Systems,
                                    Inc.,  a  manufacturer  of  emergency  alert
                                    systems.

Harold M. Mire (9)                  Vice president of Dixie Rice and Southwest.

Cecil H. Moore, Jr. (10)            Director of NL and Kronos  Worldwide;  and a
                                    private investor.

Andrew B. Nace                      Vice president and general counsel of TIMET.

Bobby D. O'Brien                    Vice president,  chief financial officer and
                                    director of Dixie  Holding,  National,  NOA,
                                    VGI and VHC;  executive  vice  president and
                                    chief  financial   officer  of  TIMET;  vice
                                    president  and chief  financial  officer  of
                                    Contran, Dixie Rice, Southwest,  Tremont and
                                    Valhi; and director of CGI.

Glenn R. Simmons                    Vice chairman of the board of Contran, Dixie
                                    Holding, Dixie Rice, National, NOA, Tremont,
                                    Valhi, VGI and VHC; chairman of the board of
                                    the  Company  and  Keystone;   director  and
                                    executive vice president of Southwest; and a
                                    director of CGI,  Kronos  Worldwide,  NL and
                                    TIMET.

Harold C. Simmons                   Chairman of the board of CGI, Contran, Dixie
                                    Holding,   Dixie   Rice,   the   Foundation,
                                    National,  NOA, Southwest,  TIMET,  Tremont,
                                    Valhi,  VGI and VHC;  chairman  of the board
                                    and  chief   executive   officer  of  Kronos
                                    Worldwide  and NL; and trustee and member of
                                    the trust investment committee of the CMRT.

Richard A. Smith (9)                Vice president of Dixie Rice.

Thomas P. Stafford (11)             Director  of NL and TIMET;  chairman  of the
                                    NASA  Advisory  Council  Task  Force  on the
                                    International Space Station Program. John A.
                                    St. Wrba Vice  president  and  treasurer  of
                                    Contran,  CGI, the Company,  Dixie  Holding,
                                    Dixie Rice, Kronos Worldwide,  National, NL,
                                    NOA, Southwest,  TIMET, Tremont,  Valhi, VGI
                                    and VHC.

Scott E. Sullivan                   Vice president and controller of TIMET.

Gregory M. Swalwell                 Vice  president  and  controller of Contran,
                                    Dixie  Holding,  National,  NOA,  Southwest,
                                    Tremont, Valhi, VGI and VHC; vice president,
                                    finance and chief financial  officer of CGI,
                                    Kronos  Worldwide and NL; vice  president of
                                    Dixie Rice and  TIMET;  and  director,  vice
                                    president and treasurer of TFMC.

J. Walter Tucker, Jr. (12)          President,   treasurer  and  a  director  of
                                    Tucker & Branham,  Inc., a mortgage banking,
                                    insurance   and  real  estate   company;   a
                                    director of Valhi; and a member of the trust
                                    investment committee of the CMRT.

Steven L. Watson                    Director  and  president  of Contran,  Dixie
                                    Holding, Dixie Rice, National,  NOA, VGI and
                                    VHC; director, president and chief executive
                                    officer  of  Valhi;  president  of  Tremont;
                                    director  and  executive  vice  president of
                                    Southwest;   director,  vice  president  and
                                    secretary of the  Foundation;  vice chairman
                                    of   Kronos   Worldwide;    vice   chairman,
                                    president  and chief  executive  officer  of
                                    TIMET;  and a director of CGI,  the Company,
                                    Keystone and NL.

Terry N. Worrell (13)               Director  of NL;  a  private  investor  with
                                    Worrell   Investments,   Inc.,  real  estate
                                    investment company.

Joan L. Yori (6)                    Vice  president-client  services  of Stewart
                                    Management Company; and director, president,
                                    secretary and assistant treasurer of TFMC.

Paul J. Zucconi (14)                A private investor and a director of TIMET.

----------

(1)      The  principal  business  address for Dr.  Barry is Southern  Methodist
         University, Perkins Administration Bldg. #224, Dallas, Texas 75275.

(2)      The principal  business  address for Mr.  Coogan is Software  Spectrum,
         Inc., 3480 Lotus Drive, Plano, Texas 75075.

(3)      The principal business address for Mr. Edelcup is 17395 North Bay Road,
         Suite 103, Sunny Isles Beach, Florida 33160.

(4)      Mr. Green is a citizen of Canada.  The principal  business  address for
         Mr. Green is 10340 Strait Lane, Dallas, Texas 75229.

(5)      Mr. Inglis is a citizen of Canada.  The principal  business address for
         Mr. Inglis is 1999 Broadway, Suite 4300, Denver, Colorado 80202.

(6)      The principal  business  address for Mr. Jacobs and Ms. Yori is Nemours
         Building, Suite 1410, 1007 Orange Street, Wilmington, Delaware 19801.

(7)      The principal  business  address for Mr.  McCollam is 402 Canal Street,
         Houma, Louisiana 70360.

(8)      The  principal  business  address for Mr.  McIlroy is 25 Highland  Park
         Village, Suite 100-341, Dallas, Texas 75225.

(9)      The  principal  business  address  for  Messrs.  Mire and  Smith is 600
         Pasquiere Street, Gueydan, Louisiana 70542-0010.

(10)     The  principal  business  address for Mr. Moore is 4444 Beverly  Drive,
         Dallas, Texas 75205.

(11)     The principal  business  address for Gen.  Stafford  (ret.) is Stafford
         Technology  Inc.,  Suite 102, 4200  Perimeter  Center,  Oklahoma  City,
         Oklahoma 73112.

(12)     The  principal  business  address for Mr.  Tucker is 1350 North  Orange
         Avenue, Suite 102, Winter Park, Florida 32789.

(13)     The principal business address for Mr. Worrell is 6909 Vassar,  Dallas,
         Texas 75205.

(14)     The  principal  business  address  for Mr.  Zucconi  is 2801 Mill Haven
         Court, Plano, Texas 75093.






                                   SCHEDULE C


         Based upon ownership  filings with the  Commission or upon  information
provided by the persons listed on Schedule B to this Statement, such persons may
be deemed to personally beneficially own Class A Shares, as outlined below:




                                                                             Stock Options Held
          Name                                        Class A Shares Held            (1)                   Total
--------------------------                            -------------------     -------------------       -----------

                                                                                                 
Eugene K. Anderson                                              -0-                   3,000                3,000

Thomas E. Barry                                                 -0-                     -0-                  -0-

James W. Brown                                                  -0-                     -0-                  -0-

Keith R. Coogan                                               3,500                     -0-                3,500

Norman S. Edelcup                                             2,000                     -0-                2,000

Lisa Simmons Epstein                                            -0-                     -0-                  -0-

Robert D. Graham                                                -0-                     -0-                  -0-

Norman N. Green                                                 -0-                     -0-                  -0-

Tim C. Hafer                                                    -0-                     -0-                  -0-

J. Mark Hollingsworth                                           -0-                   7,000                7,000

Bruce P. Inglis                                                 -0-                     -0-                  -0-

Francis B. Jacobs, II                                           -0-                     -0-                  -0-

Keith A. Johnson                                                -0-                   4,000                4,000

William J. Lindquist                                            -0-                  10,000               10,000

A. Andrew R. Louis                                              -0-                   4,000                4,000

Kelly D. Luttmer                                                200                   4,000                4,200

Andrew McCollam, Jr.                                            -0-                     -0-                  -0-

W. Hayden McIlroy -0- -0- -0-

Harold M. Mire                                                  -0-                     -0-                  -0-

Cecil H. Moore, Jr.                                             -0-                     -0-                  -0-

Andrew B. Nace                                                  -0-                     -0-                  -0-

Bobby D. O'Brien                                                300                  10,000               10,300

Glenn R. Simmons (2)                                         16,500                  55,600               72,100

Harold C. Simmons (3)                                        76,900                     -0-               76,900

Richard A. Smith                                                -0-                     -0-                  -0-

Thomas P. Stafford                                              -0-                     -0-                  -0-

John A. St. Wrba                                                -0-                     -0-                  -0-

Gregory M. Swalwell                                             -0-                   5,000                5,000

Scott E. Sullivan                                               -0-                     -0-                  -0-

J. Walter Tucker, Jr. -0- -0- -0-

Steven L. Watson                                              7,000                  15,600               22,600

Terry N. Worrell                                                -0-                     -0-                  -0-

Joan L. Yori                                                    -0-                     -0-                  -0-

Paul J. Zucconi                                                 -0-                     -0-                  -0-


----------

(1)      Represents  Class A Shares issuable  pursuant to the exercise within 60
         days of the date of this Statement of stock options.

(2)      Includes  500 Class A Shares  held  directly by Mr.  Glenn R.  Simmons'
         spouse. Mr. Simmons disclaims beneficial ownership of all such Shares.

(3)      Includes  20,000 Class A Shares held directly by Mr. Harold C. Simmons'
         spouse.  Does not  include  other  Shares of which Mr.  Simmons  may be
         deemed to possess indirect beneficial ownership as described in Items 2
         and 5(a) of this  Statement.  Except for the 56,900 Class A Shares that
         he holds directly,  Mr. Simmons disclaims  beneficial  ownership of all
         Shares.