Bosch is a leading manufacturer of accessories for power tools and is an innovation leader with 125 years of tradition. Bosch's aim is to develop innovative accessories for all applications, for more efficient working and for new materials. With more than 8000 products, Bosch offers the appropriate accessories for virtually all applications, users and all brands of power tools. Slotted screw = S, Phillips = PH, Pozidriv = PZ;The new Multi Fit universal holder with the part number 2 608 521 300 makes it easier to use double ended bits.