Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 9.9" Diameter x 10" Pitch Right-Hand Rotation 3 Blades Aluminum Black Finish QA3808R. Overview. There's a calm satisfaction that comes with knowing your boat will respond exactly how you expect - smooth throttle, steady lift, and quiet confidence as you cut across the water. That's what the Quicksilver Black Diamond 9.9" x 10" Aluminum Propeller delivers every time you head out. It's not about chasing speed or flash; it's about depen