The BlueSpot 6 PCE 1/2" Spline Sockets (M14-M18) are manufactured from heat treated, tempered chrome molybdenum for increased durability. The blackened phosphate coating protects against corrosion. Ideal for use with impact guns and high torque tools. Contains socket sizes: M14x78mm, M16x78mm, M18x78mm, M14x43mm, M16x43mm, M18x43mm. Complete with a handy carrying case for quick and easy storage.