FOR FRESHWATER USE ONLY These are mil-spec magnesium anodes for FlexOfold 3-Blade and 4-Blade propellers (up to 23"). They also fit FlexOfold 2-Blade "LA" type props (2016 and later). Beware of cheap internet anodes with suspect materials and quality, and avoid re-using bolts without underwater thread locker. Includes stainless mounting screw with pre-applied underwater thread locker. 2-5/8" base diameter Limit assembly torque to no more than 7.2 ft/lbs (requires 6mm Allen wrench) High quality Mil-Spec Magnesium alloy Freshwater use only Magnesium is the best anode material choice for boats that are used in freshwater - where traditional zincs will not protect as well. If your boat frequents both salt and fresh water, you may want to consider our Aluminum anode. If your boat stays in salt water, then our zinc anode is the best choice. Compatible with: FlexOfold 3-Blade and 4-Blade props, as well as on FlexOfold "LA-type" 2-Blade propellers. Fitment check before ordering FlexOfold Magnesium Anode Part for Propeller is a model-specific propeller part. Match the part to the propeller already on the boat before ordering. Field What to verify Part family Anode Fitment clue from this page Match magnesium anode family. Check on your propeller Blade count, shaft or saildrive family, hub markings, current part number, and water type for anodes. If unsure Send photos of the propeller open and closed, the old part, and any markings before ordering. Parts FAQ Are FlexOfold parts interchangeable across propeller families? No. Many anodes, cover plates, service kits, shock absorbers, nuts, and washers depend on blade count, shaft/saildrive family, and part number. Should I buy parts before haulout? Yes, if the part number is known. For unknown parts, gather photos and markings before haulout so the right parts can be ready. Browse related items in FlexOfold propeller parts and accessories.