... 1. Screw Material:Iron,stainless steel 2. Coating: copper plate 3.size:ST2.2-ST9.5, L=9.5mm ... -90mm Carbon Steel Copper Plating Cross Recessed Pan Head Tapping Screws for plastics ... 1)Material:Iron,stainless steel,copper and etc..2)size:ST2.2-ST9.5, ... ,BS,ANSI...ETC4)Surface Finish: gold finish, zinc plate, plain finish, chromated, nickel plated, dacromat and etc ...