Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 16" Diameter x 13" Pitch Right-Hand Rotation 3-Blade Aluminum High-Gloss Black Finish QA2004X. Overview. Every boater has that one prop they trust the one that delivers a clean, confident takeoff and feels rock steady once you're cruising. The Quicksilver Black Diamond 16" x 13" Pitch Propeller ( QA2004X) is that kind of dependable companion. It's not flashy or overcomplicated it just works, trip after trip. Whether you're towing the