Additional Information

Exhibit 99 - Additional Information


     CompX Group, Inc. ("CGI"),  TIMET Finance Management  Company ("TFMC"),  NL
Industries, Inc. ("NL"), Harold C. Simmons and his spouse are the direct holders
of 49.4%, 9.2%, 1.3%, 1.1% and 0.4%  respectively,  of the outstanding shares of
class A common stock, par value $0.01 per share (the "Class A Common Stock"), of
the issuer.

     CGI holds 100%, or 10,000,000  shares, of the issuers Class B Common Stock,
par value $0.01 per share (the "Class B Common Stock", and collectively with the
Class A Common  Stock,  the "Common  Stock").  The  description  of the relative
rights of the Common Stock  contained in the issuer's  restated  certificate  of
incorporation is hereby  incorporated  herein by reference to Exhibit 3.1 of the
issuers Registration Statement on Form S-1 (File No. 333-42643).  As a result of
its  ownership  of all  of  the  Class  B  Common  Stock,  CGI  currently  holds
approximately  82.6% of the  combined  voting  power  (97.5% for the election of
directors) of all classes of voting stock of the issuer.

     Titanium Metals  Corporation  ("TIMET") is the direct holder of 100% of the
outstanding  common stock of TFMC.  Tremont LLC ("Tremont"),  Harold C. Simmons'
spouse, The Combined Master Retirement Trust (the "CMRT"), Valhi, Inc. ("Valhi")
and Harold C. Simmons are the holders of approximately 36.9%, 13.8%, 11.3%, 4.2%
and 2.1%, respectively,  of the outstanding shares of common stock of TIMET. The
ownership of Ms. Simmons  includes  5,333,333  shares of TIMET common stock that
she has the right to acquire upon conversion of 1,600,000 shares of TIMET 6-3/4%
Series A Convertible  Preferred  Stock, par value $0.01 per share (the "Series A
Preferred  Stock"),  that she holds  directly.  The ownership of Valhi  includes
49,000  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 Ms. Simmons and
Valhi assumes the full conversion of only the shares of Series A Preferred Stock
owned by her or Valhi, respectively.

     Valhi is the direct holder of 100% of the outstanding  membership interests
of Tremont.  Valhi Holding Company ("VHC"), the Harold Simmons Foundation,  Inc.
(the "Foundation"), the Contran Deferred Compensation Trust No. 2 (the "CDCT No.
2") and the  CMRT  are the  direct  holders  of  91.4%,  0.9%,  0.4%  and  0.1%,
respectively,  of the common stock of Valhi. Valhi Group, Inc. ("VGI"), National
City Lines, Inc. ("National") and Contran Corporation ("Contran") are the direct
holders of 87.4%, 10.3% and 2.3%, respectively,  of the outstanding common stock
of VHC. National,  NOA, Inc. ("NOA") and Dixie Holding Company ("Dixie Holding")
are the direct holders of approximately 73.3%, 11.4% and 15.3%, respectively, of
the outstanding  common stock of VGI.  Contran and NOA are the direct holders of
approximately 85.7% and 14.3%, respectively,  of the outstanding common stock of
National.  Contran and Southwest Louisiana Land Company, Inc.  ("Southwest") are
the  direct  holders of  approximately  49.9% and  50.1%,  respectively,  of the
outstanding  common  stock of NOA.  Dixie Rice  Agricultural  Corporation,  Inc.
("Dixie Rice") is the direct holder of 100% of the  outstanding  common stock of
Dixie Holding.  Contran is the holder of 100% of the outstanding common stock of
Dixie Rice. Contran is also the holder of approximately 88.9% of the outstanding
common stock of 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 is 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.

     The CDCT No. 2 directly holds  approximately  0.4% of the outstanding 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  11.3% 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.  Mr.  Simmons  is the sole  trustee of the CMRT and a
member  of the  trust  investment  committee  for the  CMRT.  Mr.  Simmons  is 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.  Valhi and TFMC are the  direct
holders of approximately 83.1% and 0.5%, respectively, of the outstanding common
stock of NL.  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 vice  chairman of the board of TIMET,  chairman of
the board of CGI, Tremont,  Valhi, VHC, VGI, National, NOA, Dixie Holding, Dixie
Rice,  Southwest  and  Contran  and  chairman  of the board and chief  executive
officer of NL.

     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 of
Class A or Class B Common  Stock  that are  directly  held by CGI,  TFMC and NL.
However,  Mr. Simmons disclaims such beneficial ownership of the shares of Class
A or Class B Common Stock beneficially owned, directly or indirectly,  by any of
such entities.

     Harold C.  Simmons'  spouse is the direct owner of 20,000 shares of Class A
Common Stock,  130,000 shares of TIMET common stock,  1,600,000  shares of TIMET
Series A Preferred Stock, 119,475 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.  Mr. Simmons disclaims beneficial ownership of all
securities that his spouse holds directly.

     Mr.  Harold C.  Simmons  is the  direct  owner of 56,900 shares of Class A
Common Stock,  703,000 shares of TIMET common stock, 257,000 shares of NL common
stock (including  stock options  exerciseable for 4,000 shares) and 3,383 shares
of Valhi common stock.

     A trust,  of which  Harold C.  Simmons and his spouse are  trustees and the
beneficiaries  are the  grandchildren  of his  spouse,  is the direct  holder of
36,500 shares of the common stock of Valhi.  Mr. Simmons,  as co-trustee of this
trust,  has the power to vote and direct the  disposition of the shares of Valhi
common stock the trust holds. Mr. Simmons disclaims  beneficial ownership of any
shares of  Valhi common stock that this trust holds.