This is a 50 piece Precision Engineer's Set which includes a 1/4" industrial quality square drive ratchet. Amongst the accessories can be found a 1/4" drive spinner handle, a T-adaptor, two extensions 50 & 150mm and a universal joint. The twelve sockets range from 4 to 13mm. Also included are three deep sockets 6 to 10mm and external Torx sockets E4 to E8. There are eighteen 1/4" drive screwdriver bits covering slotted, Torx, Pozi and Phillips screws and finally five hex keys 1.25 to 3mm.