Champion Iridium Plug Number RC10WYPB4 Spark Plug - 9001 Part #: 9001 Line: CHP Champion Iridium Plug Number RC10WYPB4 Spark Plug 2 Year LIMITED WARRANTY Seat: Gasket Thread Size: M14 Heat Range: 10 Hex Size (in): 5/8 Inch Preset Gap (in): 0.041 Inch Preset Gap (mm): 1.05mm Center Electrode Tip Material: Iridium Ground Electrode Tip Material: Platinum Service Number: RC10WYPB4 Metallurgy: Iridium/Platinum Show More Show Less