MARTYR 63mm Max Prop Anode, 0.65oz.

Canada Metal zincs are composed of an alloy that meets Mil-Spec MIL-A-18001 for sacrificial anodes. This alloy is mostly zinc, but with measurable concentrations of cadmium (~0.1%) and aluminum (~0.25%).

The additional cadmium causes the anode to erode from the surface inward, which causes a ''sandblasted'' appearance to the surface. When the anode is almost dissolved, it needs to be replaced.

Canada Metal uses a special steel combination fastener that makes it possible to use their Balldriver, which is a hex driver with a universal ball tip, to make easy adjustments. This is especially important to divers, who may have a difficult time with conventional fasteners underwater.

• New universal six-hole design fits three- and six-hole MaxProp shaft nuts.