tapping screws for plastics 1. Screw Material:Iron,stainless steel 2. Coating: ... =9.5mm-90mm Carbon Steel Copper Plating Cross Recessed Pan Head Tapping Screws for plastics 1)Material:Iron,stainless steel,copper and etc ... , dacromat and etc...5)Head type: pan head,oval head,H.W.H head,H.WF head,C.S.K head ,truss head.6)Head recess: philips, slotted, combi ...