Elora 12 square drive deep bi hexagon sockets elora 25135 professional quality sockets manufactured from chrome vanadium steel hardened tempered and chrome plated for corrosion protection chamfered end allows positive nut location and entry hole for driving accessory spring loaded ball overall length 80mm sold loosemanufactured to din 3124iso 2725 specifications elora 25135 21mm 12 square drive deep bi hexagon socket