This Extra Hard Screwdriver Bit from Bosch is designed for universal use with screwdrivers and drill drivers, featuring a 1/4-inch external hex shank. It is constructed from S2 Modified Steel with an optimized heat treatment process for enhanced durability and performance. The bit's tapered torsion zone effectively absorbs torque peaks and vibrations during screw-driving, ensuring reliability in all tasks. It is suitable for PZ2 screw heads and measures 49mm in length.