Cast from high quality magnesium to fit perfectly on your 1988 and newer (serial No. 0B664190 and up) MerCruiser Bravo One sterndrive. Includes flat trim tab anode, drive shaft plate anode, lift ram anodes, bearing carrier anode. Designed for use only in fresh water to help protect your Bravo One Drive from the harmful effects of galvanic corrosion. Inspect annually and easy to replace. Attaching hardware kit included.