Mercury - Black Max 3-Blade Aluminum Propeller 12.75" Diameter x 21" Pitch Right-Hand Rotation 3-Blade Aluminum Phantom Black Finish 77348A45. Overview. Every boater knows that feeling when everything clicks-when the engine hums, the throttle responds, and the boat lifts effortlessly onto plane. That's the kind of connection you get with the Mercury Black Max 3-Blade Aluminum Propeller (Part Number 77348A45). It's built for balance, for responsiveness, and for that quiet confidence you feel when