f4kro100317hcs.txt





Exhibit 99 Additional Information



 Valhi, Inc. ("Valhi"), NL Industries, Inc. ("NL"), Harold C. Simmons,

TIMET Finance Management Company ("TFMC") and Harold C. Simmons' spouse are

the holders of 59.2%, 36.0%, 0.5%, 0.2% and 0.1%, respectively, of the

outstanding shares of common stock, par value $0.01 per share ("Common

Stock"), of the issuer.



 Titanium Metals Corporation ("TIMET") directly owns 100% of the

outstanding common stock of TFMC. Valhi Holding Company ("VHC"), Harold C.

Simmons' spouse, The Combined Master Retirement Trust (the "CMRT"), Harold C.

Simmons, NL, Valhi and the Harold Simmons Foundation, Inc. (the "Foundation")

are the holders of approximately 26.3%, 12.0%, 8.6%, 4.1%, 0.8%, 0.5% and

less than 0.1%, respectively, of the outstanding common stock of TIMET. NL's

percentage ownership of TIMET common stock includes 0.3% directly held by a

subsidiary of NL.



 Valhi and TFMC are the direct holders of approximately 83.1% and 0.5%,

respectively, of the outstanding common stock of NL. VHC, TFMC, the Foundation,

the Contran Amended and Restated Deferred Compensation Trust (the "CDCT"),

Harold C. Simmons' spouse, Harold C. Simmons, the CMRT and Contran Corporation

("Contran") are the direct holders of 92.2%, 1.1%, 0.9%, 0.3%, 0.2%, 0.2%, 0.1%

and less than 0.1%, respectively, of the outstanding common stock of Valhi.

Dixie Rice Agricultural Corporation, Inc. ("Dixie Rice") is the direct holder of

100% of the outstanding common stock of VHC. Contran is the holder of 100% of

the outstanding common stock of Dixie Rice.



 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 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

disclaims beneficial ownership of, and a pecuniary interest in, all Contran

shares that the Trusts hold.



 Harold C. Simmons is the chairman of the board of each of the issuer,

Valhi, TIMET, VHC, Dixie Rice and Contran and the chairman of the board and

chief executive officer of NL.



 The Foundation directly holds less than 0.1% of the outstanding shares of

TIMET common stock and 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 CMRT directly holds approximately 8.6% 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. Contran's board

of directors selects the trustee and members 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.



 The CDCT directly holds approximately 0.3% of the outstanding shares of

Valhi common stock.  U.S. Bank National Association serves as the trustee of

the CDCT.  Contran established the CDCT as an irrevocable "rabbi trust" to

assist Contran in meeting certain deferred compensation obligations that it

owes to Harold C. Simmons.  If the CDCT 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, Contran (i)

retains the power to vote the shares of Valhi common stock held directly by

the CDCT, (ii) retains dispositive power over such shares and (iii) may be

deemed the indirect beneficial owner of such shares.



 By virtue of the holding of the offices, the stock ownership and his

services as trustee, all as described above, (a) Harold C. Simmons may be

deemed to control such entities and (b) Mr. Simmons and certain of such

entities may be deemed to possess indirect beneficial ownership of shares

directly held by certain of such other entities. However, Mr. Simmons

disclaims such beneficial ownership of, and a pecuniary interest in, the

shares beneficially owned directly or indirectly by any of such entities,

except to the extent of his vested beneficial interest, if any, in shares

held by the CDCT or the CMRT. Mr. Harold Simmons disclaims beneficial

ownership of, and a pecuniary interest in, all shares of Common Stock that

Valhi, NL or TFMC directly holds.



 Harold C. Simmons' spouse is the direct owner of 54,856 shares of

Common Stock, 292,225 shares of NL common stock, 21,575,875 shares of TIMET

common stock and 203,065 shares of Valhi common stock. Mr. Simmons may be

deemed to share indirect beneficial ownership of such shares. Mr. Simmons

disclaims all such beneficial ownership.



 Harold C. Simmons directly holds 235,509 shares of Common Stock,

881,600 shares of NL common stock, 7,421,787 shares of TIMET common stock and

180,432 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

15,432 shares of TIMET common stock and 31,800 shares of Valhi common stock.

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, and a pecuniary interest in, any

shares that this trust holds.



 NL and a subsidiary of NL directly own 3,604,790 and 1,186,200 shares

of Valhi common stock, respectively. As already discussed, Valhi directly

holds 83.1% of the outstanding shares of NL 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. For the purposes

of the percentage calculations herein, such shares are not deemed

outstanding.