7 piece mixed 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 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. Includes: #2PH/#2PH, #2SQ/#2SQ, #2PH/#2SQ, T20/T25, T25/ T25, 8-10SL/#2PH, and attachment.