Champion Iridium Plug Number RER10WMPB4 Spark Plug - 9023 Part #: 9023 Line: CHP Champion Iridium Plug Number RER10WMPB4 Spark Plug 2 Year LIMITED WARRANTY Seat: Gasket Heat Range: 10 Hex Size (mm): 16mm Hex Size (in): 5/8 Inch Preset Gap (in): 0.040 Inch Preset Gap (mm): 1mm Thread Reach (in): 1.043 Inch Center Electrode Tip Material: Iridium Insulator Height (in): 0.100 Inch Ground Electrode Tip Material: Platinum Service Number: RER10WMPB4 Metallurgy: Iridium/Platinum Show More Show Less