NGK # 1675 Laser Platinum Spark Plug PFR7S8EG --- 4 PCS *NEW* Trivalent metal plating provides anti-corrosion and anti-seizing properties Flashover prevented by corrugated ribs Better heat transfer provided by the pure alumina silicate ceramic insulator Better heat transfer provided by the pure alumina silicate ceramic insulator Height: 50.5mm (1.98in) from the seat to the top of the terminal nut