Manufacture and supply various full series of screwdriver bits, nut setters, nut drivers, sockets, socket adapters, bit holders Screwdriver bitMaterial types: Cr-V 6150, 8660, S2Surface ... driver (nut setter)Material: Cr-V steel, types: non-magnetic and magneticSurface treatment: Zn-coating, sandblasted, Ni-coating, Cr-coatingFitting nut ...