Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 13.75" Diameter x 15" Pitch Right-Hand Rotation 3-Blade Aluminum High-Gloss Black Finish QA2208X. Overview. Every boater knows that feeling when everything just clicks - when your boat glides onto plane smoothly, responds effortlessly to throttle, and tracks straight through the turns. The Quicksilver Black Diamond 13.75" x 15" Pitch Propeller (QA2208X) delivers exactly that. It's the kind of prop you can count on trip after trip, of