Champion Spark Plugs Champion Spark Plugs OL82C 4 High quality plugs with all the features that makes Champion spark plugs the industry's leader. Triple coated shell for excellent corrosion resistance. Triple seal assembly the strongest in the industry. Precision tooled threads conform to all manufacturers' specifications. Clear Lenses, Two 12 Volt Bulbs Included Certified for use on Sail or Power Driven Vessels under 20 meters (65.6 feet.) in Length. Black Plastic and Chrome plated Zinc Alloy Top. Black Plastic Base.3/4" Inch Diameter Anodized Aluminum Tubes. Plastic Adapters for Flat or "V" type mount, contains notch for through-base wiring Fold-Down, adjustable angle