Mercury - Quicksilver Black Diamond Bravo Two Propeller 18.8" Diameter x 17" Pitch Right-Hand Rotation 3 Blades Aluminum Black Finish 8M0155030. Overview. There is a kind of peace that comes when everything on your boat just works together-the engine hums, the water glides by, and the prop does its job without you even thinking about it. That is what the Quicksilver Black Diamond Bravo Two Propeller (Part Number 8M0155030) delivers: quiet confidence, dependable performance, and effortless contro