BL. Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 9.25" Diameter x 10" Pitch Right-Hand Rotation 3-Blade Aluminum High-Gloss Phantom Black Finish QA3914R. Overview. There's a certain kind of satisfaction that comes when your boat feels perfectly tuned when the throttle responds effortlessly, the waterline stays steady, and you can sense that quiet connection between power and control. The Quicksilver Black Diamond 9.25" x 10" Pitch Propeller (QA3914R) delivers that kind of confi