These Facom 12-point OGV sockets have a 3/8 inch drive to fit 3/8 inch 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 FCMJ17 socket has the following specifications:Socket size: 17mm.Length: 30mm.Weight: 52g.