Complete, replacement aluminum anode kit 8M6008009 fits 40-50 hp Yamaha outboards. Stainless steel hardware and installation hardware provided with easy instructions. Aluminum is 50% lighter and lasts up to 50% longer than zinc in harsh, saltwater environments and is more efficient in protecting the outboard, drive and boat from galvanic corrosion. Protect your outboard from the harmful effects of galvanic corrosion. Inspect annually and easy to replace. Periodic maintenance and service helps protect your investment in your engine and your boating pleasure. See your owners manual or service manual for specific application and instructions. The Quicksilver brand is the leader in delivering uncompromising engine oils, parts and accessories to the marine industry for over 65 years. Quicksilver is the premier supplier of Mercury Marine Original Equipment replacement engine parts, oils, and accessories, but also works to serve all Original Equipment brands in the marine and powersports industries. It has earned a loyal following by providing the highest quality products that are tested through some of the most rigorous environments and testing procedures. No aftermarket company comes close to the level of research and design as Quicksilver; buying Quicksilver is buying performance, protection and peace of mind.