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. The bits are Power Groove designed for compatibility with the IRWIN® Impact Performance Series™ magnetic screw-hold attachment. 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. IRWIN Phillips pozi torx Impact Screwdriver Pocket Bit Set, 5 Piece