Mercury - Black Max 3-Blade Aluminum Propeller 15.5" Diameter x 15" Pitch Right-Hand Rotation 3-Blade Aluminum Phantom Black Finish 78116A45. Overview. There's a certain kind of satisfaction that comes from easing the throttle forward and feeling your boat respond-steady, confident, and smooth. The Mercury Black Max 3-Blade Aluminum Propeller (Part Number 78116A45) is built for that exact moment. It's the kind of prop you count on whether you're running across glassy morning water or cutting thr