Longer pro impact power bits are designed to reach easily into boxes and panels Hex pockets have minimal chamfering increasing surface contact between the nut and driver S2 Impact-Rated Steel for maximum life Bits are color coded with the ASME standard for easy identification Standard 1/4-Inch hex shank Includes 3, 5/16-Inch power nut drivers Can be found along other sizes and tips in the Pro Impact Power Bit Set (Cat. No. 32799)