This high quality 171 piece socket wrench set is suitable for universal use in this kit you will find the most popular sizes adapted to the corresponding drive sizes different ratchet drives extensions and threaded inserts are available depending on size and the required force all tools are made of alloyed chrome vanadium matt chrome plated bits made of s 2 steel the drive sockets are not driven via the corners but on the edges thereby preserving the nuts and optimizing force tran