These Facom 6-point OGV sockets have a 1/4 inch drive to fit 1/4 inch ratchets. They are high quality and ideal for tightening and loosening bolts nuts and other fasteners.The sockets are available in a range of metric sizes.Performance: conforms to ISO 2725-1 DIN 3124 and NF ISO 2725-1.The FCMR13 13 Socket has the following specification:Socket size: 13.0mm.Length: 22mm.Weight: 23.7g.PTDFCMR13