Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 9" Diameter x 7" Pitch Right-Hand Rotation 3 Blades Aluminum Black Finish QA2124. Overview. There's nothing like the feeling of pushing off from shore, hearing your outboard hum, and watching the water curl behind your boat. The Quicksilver Black Diamond 9" x 7" Aluminum Propeller is built for those easygoing days - the ones when reliability and simplicity matter most. It's a small prop with a big reputation, trusted by boaters who j