It has a 1/4-inch external hex shank and is intended for universal screw-driving with screwdrivers and drill drivers. This Extra Hard Screwdriver Bit is a good choice for universal use. All tasks are achievable thanks to the bit´s S2 Modified Steel and an optimised heat treatment process resulting in extra-hard quality, enabling adequate performance in all tasks. The bit´s tapered torsion zone copes easily with torque peaks as it absorbs force and vibrations when screw-driving and thus fulfilling all tasks. Drive ISO 1173 C6.3, 1/4" external hex shank • Universal Use • The Extra Hard Screwdriver Bit is a good choice for universal use • S2 Modified Steel and an optimised heat treatment process results in extra-hard quality for adequate performance • The tapered torsion zone copes easily with torque peaks, fulfilling all tasks Specifications: Dimensions: HEX8 Length mm: 25