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. Manufactured from chrome vanadium steel. Chemically blackened to protect against corrosion. Ideal for use with air tools. Complete with metal tin for quick and easy storage.