Whitworth socket set - 3/8" square drive Chrome Vanadium Hardened Steel- Bright finish nickel plating. Full set of sockets in the following Whitworth sizes. 1/8, 3/16, 1/4, 5/16, 3/8, 7/16, 1/2, Whitworth. Why risk damaging your cars fittings! Use the correct socket. Sockets come on a storage rail.