Mercury - Quicksilver Black Diamond Bravo Two Propeller 17.50" Diameter x 23" Pitch Left-Hand Rotation 3-Blade Aluminum Black Finish QA1953R. Overview. When you're pushing a heavy boat through big water, you need a prop that doesn't hesitate - one that digs in and delivers every bit of thrust you ask for. That's exactly what you get with the Quicksilver Black Diamond Bravo Two Propeller. It's built with strength and authority, giving your MerCruiser Bravo Two drive the muscle it needs to move se