3/8" square drive metric hex sockets manufactured from chrome vanadium steel, hardened, tempered chrome plated & polished, chamfered ends for positive nut location & special radius design to give added torque & life expectancy. Sockets have a knurled band for extra hand grip & a hole for positive ball retention. Manufactured in accordance with DIN3124/ISO2725 & DIN 3120/ISO 1174. Set contents 8, 10, 11, 12, 13, 14, 15, 17, 19 mm.