self Tapping screw Material:Carbon Steel Finish:nickel plating Certificate:ISO9001:2008, ISO14001:2004 Support:Senior worker Features:DIN7971 carbon steel Cheese Head Nickel plating self tapping Screws Material Iron,mild carbon steel, stainless steel,copper and etc..Head type pan head,oval head,H.W.H head,H.WF head,C.S.K head ,truss head.Standard DIN,JIS ISO ,BS,ANSI...ETCSurface Finish zinc ...