... : wood screw, chipboard screw, ball screw, hex head screwbolt screw, bolts and nuts, self drilling screw, self tapping screw, machine screw, furniture screwdrywall screw ... rolled steel with various plating 2) Head style: pan, round, flat, oval, truss, hexagon flange, bugle, wafer, hinge, binding, button, truss3) ... can manufacture as your drawings or samples with Quality Gaurantee self tapping screw