Champion Copper Plug Number P-RZ7HC Spark Plug - 706 Part #: 706 Line: CHP Champion Copper Plug Number P-RZ7HC Spark Plug 2 Year LIMITED WARRANTY Seat: Gasket Thread Size: M10 Heat Range: 7 Hex Size (mm): 16mm Hex Size (in): 5/8 Inch Preset Gap (in): 0.026 Inch Preset Gap (mm): 0.7mm Thread Reach (in): 0.500 Inch Resistor Plug: Yes Center Electrode Core Material: Nickel-Copper Alloy Center Electrode Tip Material: Nickel Ground Electrode Tip Material: Nickel Thread Reach (mm): 12mm Service Number: P-RZ7HC Metallurgy: Copper Show More Show Less