* The ultimate in the evolution of spark plug technology and performance from NGK, the industry leader * The iridium electrode is 25% smaller than a platinum electrode, and it's just 1/4 the size of a conventional nickel electrode * Ultra-small-diameter center electrode reduces voltage requirement and extends ignition system life * New metal shell plating has enhanced anticorrosion qualities * 10mm thread * 3/4" reach
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NGK Iridium IX IMR9C-9HE Platinum Spark Plug