IRWIN® Impact Pro Performance 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. Supplied in a robust, storage case. Contains: 4 x 25mm PH/TORX Bits: PH2/T2.4 x 25mm Pozi Bits: PZ2.1 x Bit Holder. IRWIN Impact Pro Performance Screwdriver Bit Set, 10 Piece