Thread Diameter: 12mm, Hex Size: 19mm (3/4"), Firing End- Iridium, Resistor type Electrode: Iridium IX, Threaded terminal ends, Iridium alloy has an extremely high melting point, perfect for high-performance engines, Iridium tip ensures high durability and a consistent stable spark, Outstanding acceleration for highest fuel efficiency and durability, Iridium design offers extreme ignitability and improved throttle response, Laser-welded iridium center electrode is resistant to heat, corrosion and electrical wear
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