4 PCS *NEW* -- NGK 6240 Laser Platinum Spark Plugs PLFR5A-11 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 Height: 50.5mm (1.98in) from the seat to the top of the terminal nut