Bosch 8pcs ExtraHard HSS Impact Pick and Click Screwdriver Bits and Drill Bits Set Bosch Accessories 2608522419Bosch Pick and Click system enables individually buildable accessory sets for fully customisable bit collections Robust screw bit for various applications S2 modified steel and an optimised heat treatment process provide the bits with an extra hard quality delivering a strong performance in all tasks Bits are colour coded for quick identification of the appropriate bit type 1 4" external hex shank intended for universal screwdriving with screwdrivers