NGK Iridium IX spark plugs feature an ultra-fine center electrode that's designed just thick enough to ensure the maximum durability and life of the spark plugs—and just thin enough to create an accurate and consistent spark. They represent the ultimate evolution of spark plug technology and performance. Iridium is the hardest metal used in spark plugs today—six times harder than platinum. This allowed NGK engineers to reduce the voltage requirement for a spark..

Spark Plug Thread Size: 14mm
Spark Plug Reach (in.):0.984"
Manufacturer Heat Range: 6
Resistor: Yes
Electrode Tip Material: Iridium
Electrode Core Material: Copper
Center Electrode Type: Projected
Spark Plug Seat Style:Tapered
Wrench Diameter: 5/8"