Mercury - Black Max 3-Blade Aluminum Propeller 9" Diameter x 9" Pitch Right-Hand Rotation 3-Blade Aluminum Phantom Black Finish 828156A12. Overview. There's something special about a boat that just feels right when you throttle up. The Mercury Black Max 3-Blade Aluminum Propeller (Part Number 828156A12) delivers that feeling every time. It's the kind of prop that's earned its reputation the honest way-through years of reliability, performance, and value. Whether you're easing away from the dock,