NGK's Laser Platinum Series Plugs provide high ignitability and longer service life. Laser-welded dual platinum surfaces ensure slow wear rate and provide stable idling, superior anti-fouling, improved fuel efficiency, and lower emissions. Tivalent metal plating provides superior anti-corrosion and anti-seizing properties. Corrugated ribs prevent flash-over. Pure alumina silicate ceramic insulator provides strength and better heat transfer, while copper core aids in heat removal. Triple seals prevent leakage. Center and ground electrodes are constructed from platinum. 14mm thread size. 1.25mm thread pitch.