1 / 4 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 4, 4. 5, 5, 5. 5, 6, 7, 8, 9, 10, 11, 12, 13 & 14mm.