Pack of 4 Genuine NGK 6544 Iridium Spark Plugs IMR9D9H

Shell
Thread Diameter: 10mm
Thread Pitch: 1.0mm
Seat Type: Gasket
Reach: 19mm (3/4")
Hex Size: 5/8" (16mm)
Terminal Type: Solid
Overall Height: ISO
Gap: .035" (0.9mm)

Center Electrode
Material: Iridium
Type: Fine Wire
Size: 0.6mm
Projection: Non-Projected

Ground Electrode
Material: Platinum
Type: Standard
Shape: Taper Cut

Specifications
Resistor: Yes
Resistor Value: 5k Ohm
Heat Range: 9
Features: 12.7mm Threaded Reach
Torque Specs: Cast Iron: 7.2-10.8 lb. ft. Aluminum: 7.2-8.7 lb. ft.