Subject : Explanation of the change in Operating result compared with the same quarter of the previous year greater than 20% To : President of the Stock Exchange of Thailand CC : Secretary-General of the Securities and Exchange Commission As Tirathai Public Company Limited summit the Q2/2006 Financial Statement ended June 30,2006 show the Net Profit 9.71 million Baht which decrease 55.44 million Baht or 85% Compared with the same period in 2005 greater than 20%. The main reasons are as followed. 1. Total revenue 401 million Baht increase 60 million Baht or 17.6% from the delivery on Schedule. 2. Cost of Good Sold 333 million Baht increase 105 million Baht or 46.25% from the increase of Raw material price (main reason from world market copper price unreasonable increased 80% from average price in Q1/2006) greater than Sales price increased. 3. Selling and Administrative expense 47.53 million Baht increase 8.63 million Baht or 22% from the increase of the expenses for exports shipments 6.67 million Baht and the increase of personnel expenditures to support the growth of business. 4. Loss of foreign exchanges 2.19 million Baht. Please be informed accordingly. Yours Faithfully, (Mr.Upakrom Thaweephoke) Deputy Managing Director (Finance and Marketing)