tapping screws for plastics 1. Screw Material:Iron,stainless steel 2. Coating: ... Carbon Steel Copper Plating Cross Recessed Pan Head Tapping Screws for plastics 1)Material:Iron,stainless steel,copper and etc..2 ... head,H.W.H head,H.WF head,C.S.K head ,truss head.6)Head recess: philips, slotted, combi, ... design and OEM,We will offer the best serve for you with the good quality and competitive price.