Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 9.3" Diameter x 9" Pitch Right-Hand Rotation 3-Blade Aluminum High-Gloss Phantom Black Finish QA3906R. Overview. There's a certain ease that comes from a boat that responds just the way you expect smooth, steady, and confident. The Quicksilver Black Diamond 9.3" x 9" Pitch Propeller (QA3906R) brings that feeling to smaller outboards with effortless precision. It's the kind of prop you can rely on day after day, season after season si