A specialist driver bit set for those fixings which, because of their unusual design, aim to discourage tampering and interference; therefore, in order to access these fasteners, Clarke's offer a useful & comprehensive set that contains a selection of Hex, XZN and Torx bits with one long and one short bit for each size. 7 hex bits - sizes from 4 to 12mm inclusive. 5 XZN bits - sizes from M05 to M12 inclusive. 7 Torx bits - sizes from T20 to T55 inclusive. 3/8 & « square drive adaptors.