Representative Image NGK Copper Plug Number CR9EK Spark Plug - 4548 Part #: 4548 Line: NGK NGK Copper Plug Number CR9EK Spark Plug 1 Year Limited Warranty Seat: Gasket Thread Size: M10-1.0 Heat Range: 9 Hex Size (mm): 16mm Hex Size (in): 5/8 Inch Preset Gap (in): 0.028 Inch Preset Gap (mm): 0.7mm 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): 48.8mm Insulator Height (in): 1.920 Inch Thread Reach (mm): 19mm Service Number: CR9EK Metallurgy: Copper Show More Show Less