... ,alloy steel,copper etc...4.surface treatment of self tapping screw:Passivation,Chromium-Plating,Black, Zinc-Plating or according ... and special spec according requirement.6.packing of self tapping screw:general export packing poly bag cartons or according ... .length:4mm~100mm8.diameter:1.6mm-9.5mmProduct nameSelf tapping screwHead typeFlatOvalBindingPanRoundTrussMetric or EnglishBoth Size3/32~1/2 M1. ...