DRAG SPECIALTIES Iridium Spark Plugs — 12 mm thread, 17.5 mm reach, 16 mm (5/8") hex, pair – 99-17 Dyna, 99-16 Touring, 00-17 CVO, 09-16 Trike, 00-17 Softail, 85-22 Sportster
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Ultra-fine iridium electrode for hotter spark and longer service life; black ceramic with red lettering and corrosion-resistant shell.