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 conical torsion zone of the bit effectively handles torque peaks, as it absorbs forces and vibrations while screwing. This allows for the completion of various tasks.