Mercury - Magnesium Anode Kit Bravo II & Bravo III Series Magnesium Protection 888760K01. Overview. There's a certain peace that settles in when you know your boat is protected, even when you're not there to watch over it. The Mercury 888760K01 Magnesium Anode Kit gives that kind of confidence to boaters who spend their weekends on freshwater lakes and rivers. You can feel the difference in how your Bravo II or Bravo III sterndrive holds up-steady, responsive, and free from the creeping effects