DRAG SPECIALTIES Spark Plugs — Thread 10 mm, Reach 19.1 mm (3/4"), Hex 16 mm (5/8"), CR9E – 18-24 Softail, 17-24 Touring, 17-24 Trike, 17-23 CVO, 15-20 Street
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Distinctive black ceramic body, 95% alumina insulator with multi-rib design, nickel-plated housing, multi-layer gaskets, and copper-core electrode for long life.