... plus, tri-wing, etc.. Special heat-treated Product Name screw driver bitsBrand Namesun-alpsLength25-300MMSurface treatmentsandblasted, tin-coating, Cu-coating, Ni ... -coating, Cr-coating, Zn-coatingMaterial6150 ,8660 ,S2Hardress58-60Head typesPH, PZ, slot ... more details.1, Our packing: 2, Our warehouse: screw driver bit