Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 9.25" Diameter x 9" Pitch Right-Hand Rotation 3-Blade Aluminum Phantom Black Finish QA2173R. Overview. There is a certain satisfaction that comes from feeling your boat respond exactly how you want it to - steady, sure, and smooth through every turn. That's the feeling you get with the Quicksilver Black Diamond 3-Blade Aluminum Propeller. It's not just a piece of metal bolted to the motor; it's the connection between your boat and th