M.C.S. Steel Public Co., Ltd. is engaged in the manufacture and distribution of structural steel products for building construction. It provides steel planning, design, fabrication, erection, and related services. It operates through the following segments: Thailand, China, and Japan. The company was founded by Naiyuan Chi on June 9, 1992, and is headquartered in Phra Nakhon Si Ayutthaya, Thailand.