Notification of the closing date for STEC-W2

March 4th, 2005 Subject: Notification of the closing date of registry of shareholders to determine the rights to receive warrants offering To: The President The Stock Exchange of Thailand Refer to: A copy of the letter Kor Lor Tor Jor. 504/2548 dated on March 2nd, 2005 from the Office of the Securities and Exchange Commission Sino-Thai Engineering & Construction Public Company Limited ("Company") hereby would like to inform that the Company had received an approval from the Securities and Exchange Commission ("SEC") to offer warrants to existing shareholders. Thus, the closing date of registry of shareholders to determine the rights to receive the warrants will be on March 17, 2005 at 12:00 p.m. The details of the warrants to purchase ordinary shares of the Company are as follows: Issuer: Sino-Thai Engineering & Construction Public Company Limited (the "Company") Type of security: Warrants to purchase ordinary shares of the Company no. 2 ("warrant") Type: Specified name of holders Term of Warrants: 3 years from the date of warrant issuance Exercise date: The first exercise date shall be the last day of the next accounting quarter from the date of warrant issuance. The following exercise date shall be the last day of each accounting quarter. The last exercise date shall be the expiration date of the warrant. Number of Warrants: 170,000,000 units Offering price: 3.00 Baht/unit Offering ratio: 6 ordinary shares per 1 unit of warrant (Fraction of shares will be discard) Exercise ratio: 1 unit of warrant per 1 ordinary share, except in the case of right adjustment pursuant to warrant terms. Exercise price: 8.50 Baht per unit, except in the case of right adjustment pursuant to warrant terms. Number of shares allocated for the conversion of warrants: 170,000,000 shares Please be informed accordingly. Sincerely yours, (Woraphant Chontong) Senior Executive Vice President Financial & Administration Division Sino-Thai Engineering & Construction PCL.