... .6-M9.5 3.surface of screw:zp,hdg,black,oxide 4.rohs iso certification flat head self tapping screw1.various kinds ... of self tapping screw available.2.high quality competive ... ,alloy steel,copper etc...4.surface treatment of self tapping screw:Passivation,Chromium-Plating,Black, Zinc-Plating or according requirement5.can ...