IRWIN Tools IMPACT Performance Series Double-Ended Screwdriver Power Bit, TORX, 2 3/8-inch length, 5-Piece Set with Magnetic Screw Hold Attachment (1903522) N/A Imported Built for maximum durability and long life with impact drivers. DoubleLokTechnology ensures both ends of bit lock securely 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 1/4" quick-change shank is designed to work with impact drivers, and reduces slipping in standard drill chucks