Denso GL3-1 Iridium Saver Performer CoGen Spark Plug Replaces RB75WPCC-1Iridium Performer Spark Plugs are the ultimate option for customers seeking the maximum plug performance and durability particularly in high-pressure lean-burn engines offering outstanding sparking ability and voltage decrease.The cross groove cut into the Iridium centre electrode tip enhances spark performance and lowers the discharge voltage.The reduced discharge voltage results in increased operating hours over a SAVER plug. Improved performance & durability Proving longer life Cross groove design (M18mm plug)ITEM SPECIFICS: Thread: 18 mmHex: 20.8 mmReach: 20.6 mmGap: 0.3 mmIf you are unsure as to whether this is the correct part for your vehicle, please don\'t hesitate to contact us. Alternatively please use the cross reference table above. Disclaimer: We have taken every care is taken in putting together lists of suitable vehicle compatibilities and component cross references, they are given for general guidance only, and they do not constitute any contractual term, representation or warranty and as such the supplier ( The Green Spark Plug Co LTD ) do not accept any responsibility in respect of any claim whatsoever and howsoever caused arising from the publication of this listing. It remains the responsibility of you (the customer) to check the specification of this item and carefully compare to your original before ordering/installing.