This heavy duty 1/2″ square drive impact socket set is designed for daily use. Suitable for air driven, mains powered and cordless impact wrenches and ratchets. Supplied in a strong case. 16 x 1/2″ square drive deep impact sockets. Metric sizes: 10,11,12,13,14,17,19,21,22,24,27mm. Imperial sizes:1/2″,9/16″,5/8″,11/16″,13/16″AF. Manufactured from chrome vanadium steel. Supplied in a tough carrying case.