tapping screws for plastics 1. Screw Material:Iron,stainless steel 2. Coating: copper plate 3.size:ST2.2- ... Carbon Steel Copper Plating Cross Recessed Pan Head Tapping Screws for plastics 1)Material:Iron,stainless steel,copper and etc..2)size ... , 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 ...