NGK Copper Plug Number MR9K-9 Spark Plug - 97469 Part #: 97469 Line: NGK NGK Copper Plug Number MR9K-9 Spark Plug 1 Year Limited Warranty Seat: Flat Thread Size: M10-1.0 Heat Range: 9 Hex Size (in): 5/8 Inch Preset Gap (in): 0.036 Inch Preset Gap (mm): 0.9mm Thread Reach (in): 0.750 Inch Resistor Plug: Yes Center Electrode Core Material: Copper Center Electrode Tip Material: Nickel Approximate Resistor Value (Ohm): 5000 Ohm Insulator Height (mm): 50.8mm Ground Electrode Tip Material: Nickel Thread Reach (mm): 19mm Service Number: MR9K-9 Metallurgy: Copper Show More Show Less