Bosch Iridium Spark Plug - 9751 Part #: 9751 Line: BOS Bosch Iridium Spark Plug 7 Year Limited Warranty Seat: Flat Thread Size: M12 Heat Range: 8 Hex Size (mm): 14mm Preset Gap (in): 0.040 Inch Resistor Plug: Yes Center Electrode Core Material: Nickel-Yttrium Alloy, Copper, Iridium Center Electrode Tip Material: Iridium Approximate Resistor Value (Ohm): 6000 Ohm Ground Electrode Tip Material: Nickel Thread Reach (mm): 26.5mm Metallurgy: Iridium Show More Show Less