... :C1022, C1018 3.surface:zp,HDG,black oxide Features: Galvanzized/Zinc Plated Indented Hex washer Head socket Tapping Screw 1.tapping ... , SUS304, SUS303, SUS316, ROHS complaint3. Surface Finish zinc plated,plain finish,black oxide, nickel plating, chromated, dacromet and etc as ... pan head,oval head, Flat head,Truss head,Hex Indent Washer Head, Fillister Head, Round Washer5. Drive systems philips, hex ...