Set of 4 Genuine NGK 7788 Spark Plugs BPR9ES

Shell
Thread Diameter: 14mm
Thread Pitch: 1.25mm
Seat Type: Gasket
Reach: 19mm (3/4")
Hex Size: 13/16" (21mm)
Terminal Type: Solid
Overall Height: JIS
Gap: .028" (0.7mm)

Center Electrode
Material: Nickel
Type: Standard
Size: 2.5mm
Projection: Projected

Ground Electrode
Material: Nickel
Type: Standard

Specifications
Resistor: Yes
Resistor Value: 10k Ohm
Heat Range: 9
Torque Specs: Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.