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,zinc plated,2 ... without hardend3. head type: CSK(FLAT) SLOTTED HEAD OVAL SLOTTED HEAD CHEESE SLOTTED PAN SLOTTED HEAD PAN PHILIP HEAD ROUND HEAD POZI HEAD TRUSS HEAD HEX HEAD4.Packing ...