Elora 12 square drive spark plug sockets elora 15329 professional quality hexagon deep 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 fitted with a rubber insert for plug protection and retention sold loosemanufactured to din 3124iso 2725 specifications elora 15329 12 square drive 10mm spark plug socket