Mercury - Black Max 3-Blade Aluminum Propeller 10.375" Diameter x 13" Pitch Right-Hand Rotation 3-Blade Aluminum Phantom Black Finish 73136A45. Overview. There's a kind of quiet satisfaction that comes with running gear you can count on something that delivers every single time you turn the key. The Mercury Black Max 3-Blade Aluminum Propeller (Part Number 73136A45) has that trustworthy, proven feel. It's the prop that makes your boat feel alive, that smooth surge onto plane, the steady grip thr