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.