Shell Thread Diameter: 14mm Thread Pitch: 1.25mm Seat Type: Gasket Reach: 19mm (3/4") Hex Size: 5/8" (16mm) Terminal Type: Solid Overall Height: ISO Gap: .043" (1.1mm) Center Electrode Material: Nickel Type: V-Cut Size: 2.5mm Projection: Projected Ground Electrode Material: Nickel Type: Standard Quantity: Set of 4pcs Specifications Resistor: Yes Resistor Value: 5k Ohm Heat Range: 5 Torque Specs Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.