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.