Shell Thread Diameter: 12mm Thread Pitch: 1.25mm Seat Type: Gasket Reach: 26.5mm (1.04") Hex Size: 9/16" (14mm) Terminal Type: Solid Gap: .031" (0.8mm) 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: 8 Features: Extended metal shell Torque Specs Cast Iron: 10.8-18 lb. ft. Aluminum: 10.8-14.5 lb. ft.