Mercury - Black Max 3-Blade Aluminum Propeller 14.25" Diameter x 21" Pitch Right-Hand Rotation 3-Blade Aluminum Phantom Black Finish 832832A45. Overview. There's something about a boat that runs smooth and steady-it just feels right. The Mercury Black Max 3-Blade Aluminum Propeller (Part Number 832832A45) is built for that feeling. It's the prop you put on when you want confidence, not surprises. Every push of the throttle feels predictable, every turn steady and true. It's not about flash or gi