IRWIN 1903514 Double-Ended Bit Set with Magnetic Screw-Hold Attachment, Steel, 4-Piece                    Double ended square bit set with Magnetic screw hold attachment. 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 great fitment, reducing stripping and cam-out. Power groove designed for compatibility with IRWINA(R) Impact Performance series magnetic screw hold attachment. Manufactured with Heavy-duty, cold forged high-grade steel to withstand high torque output. Includes (3) #2SQ/#2SQ and attachment.