These Facom 12-point OGV sockets have a 3/8in Drive to fit 3/8in ratchets. They are high quality and ideal for tightening and loosening bolts nuts and other fasteners. The sockets are available in a range metric sizes. Performance: conforms to ISO 2725-1 DIN 3124 and NF ISO 2725-1.The FCMJ13 socket has the following specifications:Socket size: 13mm.Length: 30mm.Weight: 36g.PTDFCMJ13