... ,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. head type: CSK(FLAT) SLOTTED HEAD OVAL SLOTTED HEAD ... ,M10,M12,M14,M16,M18,M20,M22,M24,M27,M30 self tapping screw with all kinds of head and sizes