Mercury - Black Max 3-Blade Aluminum Propeller 7.4" Diameter x 6" Pitch Right-Hand Rotation 3 Blades Aluminum Glossy Phantom Black Finish 815084A01. Overview. There is something reassuring about gear that just works every time you need it to. The Mercury Black Max 3-Blade Aluminum Propeller is exactly that - a dependable, well-balanced prop built to keep your small outboard running smooth and steady. It's lightweight yet tough enough to handle everyday use, delivering quiet thrust and clean hand