The Irwin Double Ended Torx Impact Screwdriving Bits are specifically engineered for use in high torque Impact Drivers. They are manufactured from heavy-duty, high-grade steel and have a 3x increased bit life compared to standard screwdriver bits. The screwdriver bits have Precision tip geometry that delivers superior fitment, reducing stripping and cam-out. They have a Power Groove design for compatibility with the IRWIN® Impact Performance Series™ Magnetic Screw-Hold Attachment. These bits feature DoubleLok Technology, which ensures that both ends of the bit lock securely in impact drivers and quick-change chucks, enabling use of two tips from one bit for added convenience and extended life.Specifications:Tips: T20.Length: 100mm.Pack quantity: 2.