Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 10" Diameter x 8" Pitch Right-Hand Rotation 3 Blades Aluminum High-Gloss Black Finish QA2190R. Overview. Every boater knows that moment when the motor settles into a smooth hum, the boat lifts gently onto plane, and everything just feels right. That kind of balance doesn't happen by accident - it comes from a prop built to do its job without fuss. The Quicksilver Black Diamond 3-Blade Aluminum Propeller gives you that steady, confide