This 1/2" Sq. Dr. Metric Socket Set (30 Piece) is manufactured and tested generally in accordance with DIN3122 and ISO3315 Specifications. Consist of expert quality twelve point sockets made from chrome vanadium steel that has been hardened and tempered with a polished finish. Each socket has a knurled ring for extra grip. Supplied with a 72 tooth reversible ratchet and accessories. Packed in a tough plastic storage case with soft grip handle.