DURABLE AND HARDWEARING: This 10 piece socket set is made from drop-forged, impact grade chrome vanadium steel and has a hardwearing black electrophoretic finish for impact resistance. SIZES: The 6 point sockets come in the following sizes: 10mm (0.4) , 11mm (0.43) , 12mm (0.47) , 13mm (0.5) , 14mm (0.55) , 16mm (0.63) , 17mm (0.7) , 19mm (0.75) , 21mm (0.83) & 22mm (0.87) ESSENTIAL PRODUCT: It is the ideal product for use with pneumatic, cordless or corded high torque impact wrenches. STORAGE CASE SUPPLIED: The sockets are supplied in a durable metal storage case.