Dual-drive spline impact bit set with adaptor and locking coupler offering the option of 1/2"" and 3/8� drives. The bits also have a 17mm Hex (6pt) head so that a spanner or ratchet wrench can be used when space is restricted. The set includes a useful range of sizes from M6 to M18 and are manufactured from one-piece chrome molybdenum, hardened and tempered to withstand the demands of impact tool use. A professional set presented in an EVA foam storage tray, for convenient tool drawer storage. 7 x 3/8""D / 17mm Spline bit sockets: M6, M8, M10, M12, M14, M16 and M18. 3/8""D / 17mm to 3/8""D impact adaptor and 1/2""D locking coupler. Impact quality chrome molybdenum with anti-corrosion black phosphate finish. Presented in an EVA foam tray (180mm x 130mm) convenient for user storage and limiting packaging waste. Hex and Star* profile sets also available. Please see Laser Part Nos. 7977 and 7978.