Suitable for mechanical maintenance workers, electronic engineers, and home enthusiasts who frequently engages in screw tightening projects Standard shank diameter, 6.35mm on the opposite side of the hexagonal shank, 1 / 4 standard shank diameter, suitable for all kind of electric screwdriver, and rechargeable screwdriver It is useful to operate electronic device, perfect for electrician and repair work Ensures compatibility with a wide screw size, while the distinctive of the Hexagonal Bit allows for easy identification and access Using the advanced steel, the overall induction hardening, not easy to wear, Manufacturer: kmgfsd