Cast from high quality magnesium to fit Mercury and Mariner outboards, 35 hp and above plus all MerCruiser Stern Drives except Bravo series. Designed for use only in fresh water to help protect your engine and from the harmful effects of galvanic corrosion. Check for proper propeller clearance at time of installation. Inspect annually and easy to replace with existing hardware and common tools. 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.