Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 9" Diameter x 10" Pitch Right-Hand Rotation 3-Blade Aluminum High-Gloss Phantom Black Finish QA3150R. Overview.. Every boater knows the quiet satisfaction of a boat that just feels right when the engine hums smoothly, the throttle responds with precision, and the water breaks evenly off the transom. The Quicksilver Black Diamond 9" x 10" Pitch Propeller (QA3150R) delivers exactly that. It's not designed to impress at first glance it'