Imported carbon steel, high hardness, wear resistance, strong and use Widely used power tools, electric screwdriver assembly, electronics industry, household appliances, furniture industry screw equipment Suitable for installation in pneumatic screwdrivers, electric screwdriver, rechargeable drill, using the wind batch The slot is maded standard technology, which has high coincidences and is suitable for different hand drills High fit with screw, strong adsorption, stable and, Manufacturer: Mekalero