Attributes Resistor: Yes Electrode Type: Taper Cut Electrode Core Material: Iridium Electrode Tip Material: Nickel Insulator Type: Projected Thread Size (IN): 0.551 Inch Quantity: Single Reach: 0.438 Inch Seat Type: Tapered Wrench Diameter: 5/8 Inch Product Description NGK IX Iridium Series 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…