Often specified as original equipment, NGK Laser Iridium spark plugs are the best combination of performance and longevity. Iridium tip is six (6) times harder than platinum providing the strongest ignitability and the longest life possible. Most Laser Iridium spark plugs feature a platinum pad on the ground electrode for even wear in DIS ignition systems. OE engineered for specific vehicle applications. Product Features: Fine wire Iridium center electrode Platinum pad at ground electrode for even wear in DIS ignition systems Engineered for specific vehicle applications Iridium tip is six (6) times harder than platinum 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: .043" (1.1mm) Center Electrode Material: Iridium Type: Fine Wire Size: 0.6mm Projection: Extended Projection Ground Electrode Material: Platinum Type: Standard Quantity: 1 box Specifications Resistor: Yes Resistor Value: 5k Ohm Heat Range: 7 Torque Specs Cast Iron: 10.8-18 lb. ft. Aluminum: 10.8-14.5 lb. ft.