Denso (3421) SK20HR11 Iridium Long Life Spark Plug, Single Plug 766383111534 Brand Walker Model 16399

Brand Walker Model 16399

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Denso (3421) SK20HR11 Iridium Long Life Spark Plug, Single Plug 766383111534 Brand Walker Model 16399Brand Denso Model SK20HR11 Single Plug Denso # 3421 Extra Long Life Iridium Plug 0. 7mm Fine Wire Iridium Tipped Center Electrode Platinum Tipped Ground Electrode Iridium plugs have an extremely long life as Iridium is 6x harder and 8x stronger than platinum. Because of the strength and hardness of iridium, there is virtually no electrode wear. This combined with a platinum tipped ground electrode, creates a spark plug that is almost impervious to