Magnesium Anode Fits Mercruiser Alpha 1 Gen 2 And Mercury High Performance Outboards Replaces Mercury 76214-5M, Martyr CM762145M, Camp 76214-5, Sierra 18-6016M, Tecnoseal 00820MG. This Is A US Military Grade Magnesium Anode made To The Highest Quality. Magnesium Is For Freshwater Use.