self tapping screw with all kinds of head and sizes finish:nickel plated,zinc plated ... with or without hardend self tapping screw with all kinds of head and sizesfasterner,screws,1.finish:nickel plated ... to ourter carton5.Standard:GB,DIN,JIS,ANSI,BA6.material:carbon steel,stainless steel,brass7.size:M3,M4,M5,M6,M7 ... M18,M20,M22,M24,M27,M30 self tapping screw with all kinds of head and sizes