Draper Expert Elora Deep Spark Plug Socket 1/2″ Drive 16mm (5/8″ AF) 771LTZ-16 extra deep, with rubber insert and bore hole Ø 9 mm chrome-plated, polished knurled female square drive according to DIN 3120-C 12,5, ISO 1174, with ball retaining groove ELORA-Chrome-Vanadium 31CrV3 / 1.2208 Number 771LTZ-16 Size mm 16,0 (5/8 AF) Thread diameter of spark plugs M10 Diameter 22mm Length 80mm Draper Stock No 15329 Part No 771LTZ-16