Mercury - Black Max 3-Blade Aluminum Propeller 8.9" Diameter x 7.5" Pitch Right-Hand Rotation 3-Blade Aluminum Phantom Black Finish 897614A10. OverviewAsk any seasoned boater - the best propellers are the ones you never have to think about. They just work, quietly and consistently, trip after trip. The Mercury Black Max 3-Blade Aluminum Propeller (Part Number 897614A10) is exactly that kind of dependable performer. It's light, responsive, and built to make small engines feel smooth and confident