NGK standard plugs are constructed for longer life and optimum performance. Trivalent metal plating provides superior anti-corrosion and anti-seizing properties Corrugated ribs prevent flashover Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer Copper core aids in heat removal Triple seals prevent leakage MPN: FR2B-D Specifications Warranty 1 Year Torque Specs Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft. Brand NGK Heat Range 2 Longevity 30k Miles Features Metal Shell Plating; Partial Thread Resistor Yes Shell Thread Size 14mm Thread Pitch 1.25mm Seat Type Gasket Resistor Value 5K Ohm Reach 19mm (3/4") Hex Size 5/8" (16mm) Terminal Type Solid Overall Height ISO Gap .035" (0.9mm) Center Electrode Material Nickel Type Standard Size 2.5mm Projection Projected Ground Electrode Material Nickel Type Standard Quantity 1