This Draper Expert 1/2 inch socket set includes 10 x 1/2" hex sockets: 9, 10, 11, 12, 13, 14, 15, 17, 18 and 19mm. The sockets are made from polished Chrome Vanadium Alloy for superior strength and durability. They feature the OGV / Maxi Drive profile which applies force to the flats of the fastener for increased turning power and reduced rounding off. Each socket has a knurled ring for extra grip and is supplied on a metal rack that can also be used to store the sockets in a tool box. The Expert brand, part number and size are visible for easy identification.