NGK Standard Spark Plugs are proven technology that offer reliable performance. Actual OE or equivalent replacement spark plug. NGK Standard Spark Plugs are treated with corrosion-resistant plating to ensure ease of installation and removal. The solid Copper Core offers superior heat dissipation, conductivity and broad heat range. Resistor Type: 0. 028. Plug Wire Minimum Diameter: 14. 00. Plug Wire Maximum Diameter: 10000. Hex Size: 3/4 in. Ground Electrode Tip Design: Standard. Ground Configuration: Standard. Ground Electrode Core Material: Nickel Core. Center Electrode Core Material: Copper. Center Electrode Tip Material: Nickel. Seat Type: Flat. Manufacturer Heat Range: 4.