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. Manufactured With Heavy-Duty, Cold Forged High-Grade Steel To Withstand High Torque Output. #2PH. 2-3.8" Overall Length.