The BlueSpot 10 Pce 1/2" Metric Impact Sockets (9-27mm) are manufactured from heat treated, tempered chrome vanadium steel for strength and durability. Ideal for use with impact guns and high torque air tools. Contains socket sizes: 9, 10, 11, 13, 14, 17, 19, 22, 24, 27mm. Complete with handy metal tin for quick and easy storage.