Spark Plug Application Automotive Marine Hex Size 5/8 in Thread Size 0.551 in Thread Reach 0.709 in Ground Electrode Quantity 1 Ground Electrode Tip Design Standard Gap Size 0.059 in Resistor Plug Yes Hex Size - Metric 15.88 mm Thread Reach - Metric 17.98 mm Insulator Material Ceramic Manufacturer Heat Range 5 Seat Type Tapered Center Electrode Diameter 0.023 in Ground Electrode Material Nickel Core Center Electrode Material Iridium Compatible Engine Type V10 V6 V8