The BlueSpot 4 PCE 1/2" Metric Cr-Mo Impact Sockets (30-36mm) are manufactured from heat-treated, tempered chrome-molybdenum for increased strength and durability. Ideal for use with impact guns and high torque air tools. Deep impact socket for increased range and precision. Contains socket sizes: 30, 32, 34, 36mm. Complete with a handy carrying case for quick and easy storage.