Elora 12 square drive hexagon sockets elora 15310 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 bearing sold loosemanufactured and tested generally in accordance with din3122 and iso3315 specifications elora 15310 21mm 12 square drive hexagon socket