The Expert E131705B 1/4in bit set comprises of 39 pieces: 4 x Slotted Bits: 4, 5.5, 6.5 and 8mm.4 x Phillips® Bits: PH1, PH2x2 and PH3.3 x Pozidriv® Bits: PZ1, PZ2 and PZ3.7 x Torx® Bits: T8, T10, T15, T20, T25, T30 and T40.7 x ResisTorx® Bits: TT10, TT15, TT20, TT25, TT27, TT30 and TT40.4 x Hex Bits: 3, 4, 5 and 6mm.7 x 6-Point Sockets: 6, 7, 8, 10, 11, 12 and 13mm. The set also includes a socket adaptor, mini ratchet and a magnetic bit holder with locking ring.