Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 10.625" Diameter x 12" Pitch Right-Hand Rotation 3 Blades Aluminum High-Gloss Black Finish QA2074X. Overview. There's a certain calm that settles in when your boat lifts cleanly onto plane and the engine hums in tune with the water beneath you. That's the kind of confidence the Quicksilver Black Diamond 3-Blade Aluminum Propeller delivers. It's not flashy or complicated-it's simply dependable. You'll feel it from the moment you throt