IRWIN Impact Pro Performance Pozidriv Screwdriver Bits have been engineered for maximum durability and turning force when used in extreme applications. The full-fit head eliminates wobble and screw head roundings. With a contoured area, so the bit tip flexes with the torque of the impact driver. Flex optimised to transfer maximum torque through the screw and maximise life. 1 x Pack of 2 IRWIN Impact Pro Performance Screwdriver Bits PZ1 57mm.