Tangshan Guofeng Screws Co.,Ltd. found in 2000.I am a manufacturer in china.We specialize in chipboard screw, wood screw and dry wall screw with the capability of more than 5000 tons per year.Standard covers: GB, JS, DIN, ISO,BS. Our company has the advanced equipment and abundant design ability. The material of above product is low carbon steel. Good quality and competitive price are our products feature. export to worldwide.