It features a 1/4-inch external hex shaft for general screw work with screwdrivers and drill drivers. This extra hard screwdriver bit is a great choice for general tasks. S2-modified steel and an optimized heat treatment process provide above-average hardness for adequate performance in all types of work. The tapered torsion zone of the bit effectively handles torque peaks, as it absorbs forces and vibrations during screwing. This allows it to tackle a wide range of tasks.