Manufactured from chrome vanadium steel with a polished mirror finish. Features a knurled ring on the bottom of the socket for high-quality single hex sockets. Includes metric sockets that are 6-point and have a 3/8" square drive, compatible with any 3/8" drive ratchet or bar. Supplied in a plastic storage tray. Sizes included: 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, and 24mm. Manufacturer: US PRO.