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Double Platinum plug, 14mm, 3/4" reach, 5/8" hex, gasket seat, resistor, ISO length, extreme projected extended tip, extreme long life double platinum, fine point platinum on center electrode, platinum tip laser welded on ground electrode NGK extreme life plug. By using the highest platinum content in the industry, NGK has created an extremely long life spark plug. Laser welded platinum tip on center electrode and platinum tip on the ground electrode. The center electrode is taper cut which aids in focusing the spark while reducing the voltage necessary to start the combustion process, this will provide better throttle response, improve efficiency and allow a smoother idle.