MAXFIT Screwdriving Set (50-Piece)DEWALT MAXFIT screw driving bits are engineered for use with Impact Drivers. Their tip geometry reduces wear and creates an ideal fit with every fastener. Each bit features a unique torsion zone to deliver long life in both metal and wood fastening applications. The S2 modified steel enhances the overall durability of the product. CNC manufacturing ensures the product consistently delivers the highest level of quality. MAXFIT optimized tip geometry