... taping screw SizeM1.0~M4.0 Material Carbon steel,stainless steel,steel and brass FinishPlating Zn,Ni,Cu,Cr and Nitridation Quality High-quality ... and selling high precision screws, such as hard disk screw, self tapping screw, patch screw, water-proof sealing screw, head colored screw, special use screw as well as ...