Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 14" Diameter x 11" Pitch Right-Hand Rotation 3-Blade Aluminum High-Gloss Phantom Black Finish QA2830X. Overview.. There's a certain satisfaction that comes from a boat that just feels right when the throttle responds cleanly, the lift feels natural, and the ride stays steady no matter the water. The Quicksilver Black Diamond 14" x 11" Pitch Propeller (QA2830X) delivers that feeling every time you take the helm.. It's the kind of prop