Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 13.4" Diameter x 13" Pitch Right-Hand Rotation 3 Blades Aluminum High-Gloss Black Finish QA2078X. Overview. There is something special about finding a prop that just feels right - the kind that makes your boat lift cleanly, steer easily, and run smooth without needing constant adjustment. The Quicksilver Black Diamond 3-Blade Aluminum Propeller does exactly that. It's a solid, dependable prop that gives you confidence every time you