Representative Image NGK Copper Plug Number CR8EB Spark Plug - 7784 Part #: 7784 Line: NGK NGK Copper Plug Number CR8EB Spark Plug 1 Year Limited Warranty Seat: Gasket Thread Size: M10-1.0 Heat Range: 8 Hex Size (mm): 16mm Hex Size (in): 5/8 Inch Preset Gap (in): 0.032 Inch Preset Gap (mm): 0.8mm Thread Reach (in): 0.750 Inch Center Electrode Core Material: Copper Center Electrode Tip Material: Nickel Approximate Resistor Value (Ohm): 5000 Ohm Insulator Height (mm): 50.8mm Insulator Height (in): 2 Inch Thread Reach (mm): 19mm Service Number: CR8EB Metallurgy: Copper Show More Show Less