Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 10.9" Diameter x 11" Pitch Right-Hand Rotation 3 Blades Aluminum Black Finish QA2070X. Overview. Every boater knows the sweet spot - that moment when your boat lifts smoothly onto plane, the engine hums low, and the water feels like glass beneath you. The Quicksilver Black Diamond 10.9" x 11" Aluminum Propeller was made for that feeling. It's the kind of prop you can count on every trip - no drama, no surprises. Just steady accelerat