STREAMLINED SHAFT ANODE 7/8 INCH Customers choose a Martyr Anode over other brands for the unique design features. A Martyr Shaft Zinc features additional zinc material around the fasteners. Therefore extending the usable life of your anodes. Don t sacrifice your boat just your Martyr Shaft Zinc! Shaft Zinc Models CMX01-CMX09 feature 2 screws and models CMX10-CMX19 feature 4 screws. Screw heads are slotted for ease of install with a Flat Head Screwdriver. Red plastic retaining washers make sure that screws will not fall out during installation. Zinc halves interlock for a snug fit. Anode Dimensions: Height – 2.