Mercury - Quicksilver Black Diamond Bravo Two Propeller 18.25" Diameter x 19" Pitch Right-Hand Rotation 3 Blades Aluminum Black Finish QA1940R. Overview. There's a certain satisfaction when a big boat moves with confidence - not hurried, not sluggish, but strong and steady, like it owns the water. That's exactly the kind of control the Quicksilver Black Diamond Bravo Two Propeller delivers. This is a prop you can feel working for you every time you throttle forward. It digs in, grips hard, and g