Professional tool for commercial or occasional use - 1/2" drive shallow metric sockets. Will fit any 1/2" drive ratchets, extensions, or bars. Features single hex / 6 sided sockets manufactured from chrome vanadium steel for strength and durability. Includes a knurled ring for maximum grip in oily or slippery conditions. The set includes the following sizes: 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 27mm, and 30mm. Comes in a plastic tray for easy storage and transportation.