Mercury - Black Max 3-Blade Aluminum Propeller 9.25" Diameter x 9" Pitch Right-Hand Rotation 3-Blade Aluminum Phantom Black Finish 897750A11. Overview. There's a certain kind of peace that comes from knowing your prop will perform exactly how you expect it to - every time you turn the key. The Mercury Black Max 3-Blade Aluminum Propeller (Part Number 897750A11) is trusted by countless boaters for that reason. It's the dependable workhorse of the water, built to deliver smooth handling, solid thr