Floating propeller block 8M0129072 can be used on all outboards and stern drives to aid the removal or installation of propellers. Hands free, plastic propeller block keeps propeller from turning when removing or installing prop nuts. Easy to slip on to anti-ventilation plate to wedge one prop blade against to keep the propeller from turning. When changing or replacing propellers, inspect your anodes for corrosion or pitting and replace as necessary. To make future propeller removal easier, coat your propeller shaft with a light application of Special Lube 101 or 2-4-C. 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.