... 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,zinc plated,2. with or without hardend3 ... ,M14,M16,M18,M20,M22,M24,M27,M30 self tapping screw with all kinds of head and sizes