The Extra-Hard Screwdriver Bit and Nutsetter Set, 43-Piece is a good choice for universal use. S2 Modified Steel and an optimised heat treatment process provide the bits with an extra-hard quality, delivering a strong performance in all tasks. The bits feature a tapered torsion zone that easily handles torque peaks by absorbing the force and vibrations when screw-driving in all materials. Furthermore, the bits are colour-coded for quick overview and recognition of the appropriate bit type. It has a 1/4-inch external hex shank and is intended for universal screw-driving with screwdrivers and drill drivers.