Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 14" Diameter x 10" Pitch Right-Hand Rotation 3-Blade Aluminum High-Gloss Phantom Black Finish QA2828X. Overview. There's something special about a prop that feels natural one that responds the way you expect, grips the water when it should, and keeps your boat steady when the chop picks up. The Quicksilver Black Diamond 14" x 10" Pitch Propeller (QA2828X) is that kind of prop. It's the dependable workhorse boaters rely on season afte