4 New NGK Iridium IX Spark Plugs CR9EIX # 3521
NGK Iridium IX Spark Plug, 10mm Thread, 19mm (3/4") Reach, 5/8" (16mm) Hex Size, Gasket Seat, Resistor, Stud Terminal, Fine Wire (0.6mm) Iridium Center Electrode, Tapered Cut Ground Electrode, .032" (0.8mm) Gap, Heat Range 9. NOTE: Does not include terminal nut