The bits are Power Groove designed for compatibility with IRWIN® Impact Performance Series™ magnetic screw-hold attachment. Contains: 7 x 25mm Phillips Bits: PH1(x2), PH2(x3) and PH3(x2). 7 x 25mm Pozidriv Bits: PZ1(x2), PZ2(x3) and PZ3(x2). 7 x 25mm TORX Bits: T20(x3), TX25(x2) and T30(x2). 5 x 50mm Phillips Bits: PH2. 5 x 50mm Pozidriv Bits: PZ2. 1 x 3in Bit Holder. Supplied in a moulded ABS resin case.