NGK single iridium plugs were designed specifically for the performance enthusiast. Fine wire center electrode ensures high durability and a consistently stable spark. Iridium alloy has an extremely high melting point, perfect for today's high-tech, high performance engines.Trivalent metal plating provides superior anti-corrosion and anti-seizing propertiesCorrugated ribs prevent flashoverPure alumina silicate ceramic insulator, provides superior strength and better heat transferCopper core aids in heat removalTriple seals prevent leakageShellThread Diameter10mmThread Pitch1.0mmSeat TypeGasketReach19mm (3/4")Hex Size5/8" (16mm)Terminal TypeThreaded StudOverall HeightISOGap.035" (0.9mm)Center ElectrodeMaterialIridiumTypeFine WireSize0.6mmProjectionNon-ProjectedGround ElectrodeMaterialPlatinumTypeStandardShapeTaper CutQuantity1SpecificationsResistorYesResistor Value5k OhmHeat Range8Torque SpecsCast Iron: 7.2-10.8 lb. ft. Aluminum: 7.2-8.7 lb. ft.Part InformationBrandNGK/NTKWarranty60 DaysLongevity100k Miles