Used on boat lifts up to 18,000lbs. ZNGUY1 BOATLIFTS Anodes with 316 STAINLESS and 10 feet long STEEL CABLE. Whether your boat is sailing in either fresh or sea water is inevitably exposed to the hazards of corrosion. Our zinc anodes due to their higher quality and perform their cathodic protection job better than the competition. Top Notch in the metal industry 99% pure zinc, Made with the gravity casting process one by one. The Zinc Guy Inc. is the worldwide manufacturer, distributor and online retailer of marine corrosion control products. We specialize in sales of sacrificial zinc anodes for pleasure-craft, commercial boats and boat lift for boating industry. The ZNGUY1 meet the standards set forth by Mil-Spec A-18001, Mil-Spec A-18001A, and Mil-Spec A-18001K With certificate of analysis.