The Irwin Impact Screwdriver Bits are specifically designed for use in high torque impact drivers. They are manufactured from heavy-duty, high-grade steel and have a 3 times longer life compared to standard screwdriver bits. Their precision tip geometry delivers superior fitment, reducing stripping and cam-out. ion-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; word-spacing: 0px;">The bits are Power Groove designed for compatibility with the IRWIN Impact Performance Series magnetic screw-hold attachment. ion-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; word-spacing: 0px;">This set contains the following: 2 x PZ2 screwdriver bits. 2 x PH2 screwdriver bits. 1 x T20 screwdriver bit. Supplied in a moulded ABS resin case.