For 97-8252-6P, Spark Plug Kit Combo For Denso 8 lbs, 4955850 Cummins Information For Denso 's Iridium Saver Plug Guarantees High Reliability for withstanding High Combustion Pressures byIncorporating a Stress Resistant Monolithic Resistor that Adheres to the Resistor Glass in the High TemperatureFurnace. This Eliminates Interference to Electronic Equipment from High Energy Coil Noise.€ Newly Developed Ceramics with Finer Grain, Molded in Higher Pressure and Higher Density PreventsElectrical Breakdown of Insulator€ Special Nickel Plating with Better Corrosive Resistance for Condensed Acid Water€ For Denso 's Unique Iridium Alloy Offers a High Welding Point which Dramatically Improves Wear ResistanceCompared to other Iridium Plugs€ 360° Laser Welding is Used to Create a Seal So Reliable theElectrode Resists Wear Even Under the Most ExtremeEngine Conditions€ 0.7mm Center Electrode Dramatically Improves Ignitability€ Ideal Plug in High Compression Lean Burn Engines Plug Specifications Thread Pitch: 1.25mm Thread Size: 14mm Reach: 19mm (3/4") Hex Size: 5/8" (16mm) Gap: .012" (0.3mm) Terminal Type: Removable Seat Type: Gasket Resistor: Yes Center Electrode Type: Standard Size: 0.7mm Material: IridiumGround ElectrodeMaterial: Platinum For all Cummins ISL CNG engines Tech Notes Kit Contains: 6 plugs and 6 boots