... 2.high quality competive price .3.material of the self tapping screw:stainless steel ,carbon steel,alloy steel,copper etc... ... 4.surface treatment of self tapping screw:Passivation,Chromium-Plating,Black, Zinc-Plating or according requirement5 ... DIN and special spec according requirement.6.packing of self tapping screw:general export packing poly bag cartons or according ...