Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 8.3" Diameter x 8" Pitch Right-Hand Rotation 3 Blades Aluminum Black Finish QA3178R. Overview. There's something undeniably peaceful about a morning out on the water - the hum of the motor, the glassy surface breaking under your boat, and that steady rhythm that keeps you moving forward. The Quicksilver Black Diamond 8.3" x 8" Aluminum Propeller is built for exactly that feeling. It's not just about getting from one point to another;