... ,zinc plated with or without hardend self tapping screw with all kinds of head and sizesfasterner,screws,1.finish:nickel plated,zinc ... HEAD HEX HEAD4.Packing:bulk packing or suitable quantity into color box,then to ourter carton5.Standard:GB,DIN,JIS,ANSI ... ,M18,M20,M22,M24,M27,M30 self tapping screw with all kinds of head and sizes