Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 9" Diameter x 9" Pitch Right-Hand Rotation 3 Blades Aluminum Black Finish QA2128R. Overview. Every boater has that moment - when the engine hums just right, the boat eases onto plane, and the water stretches out like glass. The Quicksilver Black Diamond 9" x 9" Aluminum Propeller was made for those days when you just want smooth, steady performance without any drama. It's a prop you can rely on time after time - simple, efficient, an