The Siam Industrial Wire Company Limited  (SIW) is one of the world 's largest manufacturers and distributors of wire products.Since 1971,SIW has manufactured Pre-stressed concrete wire( PC.Wire) ,Pre-stressed concrete 7-wire strand (PC.Strand ),Cold-drawn steel wire ,and Wire Mesh.SIW factory is located on a 30-acre area(60 rai) in the Rayong Industrial Land. SIW is the largest wire manufacturing company in Asia with an annual production capacity of 180,000 metric tons. (website : www.siw.co.th)