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.