... ; OEM from China; Certification:ISO14001:2004 ISO9001:2008 Specifications Drywall screw Process Capablilities Standard ISO, GB, DIN, JIS, ... Haixingcheng Metal Products Co., Ltd. is a manufacturer of screws with well-equipped testing equipment and strong technical force. ... equipment from Taiwan area, and mainly produces forged fastener precise screws, which are made of titanium, copper, aluminum, iron ...