Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 8.9" Diameter x 8.5" Pitch Right-Hand Rotation 3 Blades Aluminum High-Gloss Black Finish QA2158R. Overview. Ask any boater who's spent time on the water, and they'll tell you - when your prop's right, the whole boat just feels better. There's that quiet hum, easy steering, and that satisfying, steady push forward each time you give it a bit of throttle That's what you get with the Quicksilver Black Diamond 3-Blade Aluminum Propeller.