NGK LKR8AP Laser Platinum Spark Plug provides high ignitability and longer service life. Dual platinum surfaces ensure slow wear rate providing stable idle, superior anti fouling, improved fuel efficiency and lower emissions. It features laser welded platinum center electrode tip, platinum disc welded to backside of ground electrode which provides long life, trivalent metal plating which provides superior anti-corrosion and anti-seizing properties and better fuel economy and lower emissions. Faster starts and quicker acceleration. Specifications: shell thread diameter 12mm, thread pitch 1.25mm, seat type gasket, reach 26.5mm (1.04"), hex size 5/8" (16mm), terminal type solid, overall height iso gap.035" (0.9mm). Center electrode: material platinum, type standard, size 2.5mm, projection projected. Ground electrode: material nickel, type multi-ground, quantity 2, specifications resistor yes resistor value 5k ohm, heat range 8, torque specs cast iron: 10.8-18 lb. ft. aluminum: 10.8-14.5 lb. ft. Part information: brand ngk/ntk warranty 60 days, longevity 50k miles.