Mercury - Black Max 3-Blade Aluminum Propeller 9.25" Diameter x 7" Pitch Right-Hand Rotation 3-Blade Aluminum Phantom Black Finish 828152A12. Overview. There's something reassuring about hearing your motor hum to life and feeling your boat ease out of the dock-steady, sure, and ready for open water. That confidence often comes down to a reliable prop, and the Mercury Black Max 3-Blade Aluminum Propeller has earned its place at the heart of that experience. It's the kind of prop that just works-t