NGK Copper Plug Number DCPR8E Spark Plug - 4339 Part #: 4339 Line: NGK NGK Copper Plug Number DCPR8E Spark Plug 1 Year Limited Warranty Seat: Gasket Thread Size: M12-1.25 Heat Range: 8 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): 49mm Insulator Height (in): 1.930 Inch Thread Reach (mm): 19mm Service Number: DCPR8E Metallurgy: Copper Show More Show Less