screw driver bit Head types:PH, PZ, slot, Torx, square ... plus, tri-wing, etc.. Special heat-treated Product Name screw driver bitsBrand Namesun-alpsLength25-300MMSurface treatmentsandblasted, tin-coating, Cu-coating, ... how and advanced production facilities enable us to offer high quality products at the most competitive prices in the industry ... details.1, Our packing: 2, Our warehouse: screw driver bit