14mm x 12 point spark plug socket services BMW, MINI, Mercedes, Porsche, Ford, Nissan, Infiniti, Toyota, Scion, Subaru, & more Thin-wall design with MAGNET for tight clearance and easy extraction OAL: 63.18mm OD: 18.45mm 3/8” Square Drive Compare to BMW Factory Tool #121220 NOTE: The factory spark plugs for the MINI N18 (2011+) engine are 14mm, but the electrode of some aftermarket spark plugs are larger, which blocks the socket from mating at the designated connection point