... shapes) Power nut /screwdriver nut:Manufacture and supply various full series of screwdriver bits, nutsetters, nut drivers, sockets, socket adapters, bit ... holders and quick changeconnectors for screwdriver bitsmaterial types:Cr-V 6150,8660,S2Surface treatment:sandblasted, tin-coating, Cu-coating, Ni ... , tri-wingType:single head, double head, head with round neck,non-magnetic and magnetic