These Facom 12-point OGV sockets have a 1/2 inch drive to fit 1/2 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: conform to ISO 2725-1, DIN 3124 and NF ISO 2725-1.The FCMS16 socket has the following specifications:Socket size: 16.0mm.Length: 36mm.Weight: 57g. This is a 1/2 in Drive 16mm Standard Socket, 12 point, 36 mm Overall Length, Metric, Bit Length: 12mm, VDE/1000V Approved: No, Finish: Chrome, Model: S.16, Material: Chrome Vanadium Steel, Drive Type: Square.