Draper expert 27mm 12 square drive diesel injector socket 6 point draper expert 21833 expert quality 12 point socket for the removal of diesel injectors from hgvs including scania and volvo forged from chrome vanadium steel hardened tempered chrome plated and polished for corrosion protection display packedmanufactured and tested generally in accordance with din3122 and iso3315 specifications draper expert 21833 28mm 12 square drive hgv diesel injector socket bi hex