Irwin 1/2 x 4 Impact Magnetic Nut Setter Bulk Pack of 5 Lobular design drives fastener on side instead of corner for less stripping and longer life Rare earth magnets hold   

DoubleLok Technology Ensures Both Ends Of Bit Lock Securely In Impact Drivers And Quick-Change Chucks, Enabling Use Of Two Tips From One Bit For Added Convenience And Extended Life.

Precision tip geometry delivers superior fitment, reducing stripping and cam-out. Power Groove designed for compatibility with Irwin Impact Performance Series magnetic screw-hold attachment

Irwin 7-Piece Impact Mixed Double-End Screwdriver Bit Set - DoubleLok Technology ensures both ends of bit lock securely in impact drivers and quick change chucks, enabling use of two tips from one bit