Manufacture and supply various full series of screwdriver bits, nut setters, nut drivers, sockets, socket adapters, bit holders Screwdriver bitMaterial types: Cr-V 6150 ... -coating, Cr-coating, Zn-coatingHead types: PH, PZ, slot, Torx, square, hex, hex-plus, Z-spanner, Torx hollow, Torx plus, tri ...