Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 8.7" Diameter x 5" Pitch Right-Hand Rotation 3 Blades Aluminum High-Gloss Black Finish QA2148R. Overview. There is something incredibly satisfying about a boat that responds instantly - the kind that glides across calm water with smooth precision and doesn't make you second-guess your throttle. The Quicksilver Black Diamond 3-Blade Aluminum Propeller captures that feeling perfectly. It's dependable, balanced, and easy to trust, even