A 37 piece socket/spanner set, equivalent to a 93 piece traditional set. Manufactured from high quality chrome vanadium steel. All sockets are manufactured to DIN 3124, ratchet and accessories to DIN 3122 and 3123 standards. All parts have a bright chrome finish Metrinch® tools are designed to drive the hexagon flats, not the corners. This enables one tool to drive metric/imperial A/F, Whitworth, BSF or BA hexagon nuts or bolts, making selection easier The set is supplied complete in a polypropylene storage case 3/8 in. to in. Male Adaptor