Champion Iridium Plug Number RES14WMPB4 Spark Plug - 9777 Part #: 9777 Line: CHP Champion Iridium Plug Number RES14WMPB4 Spark Plug 2 Year LIMITED WARRANTY Seat: Tapered Thread Size: M14 Heat Range: 14 Hex Size (mm): 16mm Hex Size (in): 5/8 Inch Preset Gap (in): 0.040 Inch Thread Reach (in): 1 Inch Center Electrode Tip Material: Iridium Insulator Height (in): 0.118 Inch Ground Electrode Tip Material: Platinum Service Number: RES14WMPB4 Metallurgy: Iridium/Platinum Show More Show Less