Built for maximum durability and long life with impact drivers. Ensures both ends of bit lock securely into impact drivers and quick-change chucks, enabling use of two tips from one bit. Precision tip geometry delivers superior fitment, reducing stripping and camout. Power Groove designed for compatibility with Irwin Impact Performance Series magnetic screw-hold attachment. 1/4″ quick-change shank is designed to work with impact drivers and reduces slipping in standard drill chucks. Includes double-ended screwdriver power bit, #2 Phillips and #8-10 slotted. Length 2-3/8.