R9IV
- Diameter ofthread: 10mm
- Length ofthread: 19mm
- Six side size: 16mm
- Calorific value: 9
D8RIV
- Diameter ofthread: 12mm
- Length ofthread: 19mm
- Six side size: 17.5mm
- Calorific value: 8
- Iridium alloy has an extremely high melting point
- Iridium electrode is 25% smaller than a platinum electrode, and is 1/4 the size of a conventional nickel electrode
- Fine wire center electrode ensures high durability and a consistently stable spark
- Ultra-small diameter center electrode reduces voltage requirement and extends ignition system life
- Corrugated ribs prevent flashover
- Metal shell plating has enhanced anti-corrosion qualities
- Copper core promotes heat removal
- Triple seals prevent leakage