Elora 12 square drive bi hexagon sockets elora 24666 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 sold loosemanufactured to din 3124iso 2725 and din 3120iso 1174 specifications elora 24666 21mm 12 square drive bi hexagon socket