The Bosch Screwdriver Bit Nutsetter Set 44pc 2607017693 is an ideal set for the trade professionals out there as well as the DIY enthusiasts. This set is versatile as it contains different lengths and types of extra-hard bits for various screw types as well as nutsetters, designed with a permanent magnet for hex screws. They have been constructed from S2 modified steel and have been heat treated to provide the bits with an extra hard quality. The bits have a tapered torsion zone that absorb the force and vibrations when screwdriving into all materials with hight torque. This set is a 44pc set it includes, a 1/4in external hex shank and a compact hand screwdriver all supplied in a robust, durable and handy storage box. Features and Benefits: Contains various screw types as well .