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, Model No. 1903524 (SKU 301944). Manufactured with heavy-duty, cold forged, high grade steel to withstand high torque output. TORX set includes 1 each: T15/T20, T20/T25, T25/T30, T25/T25, and magnetic screw-hold attachment.