Mercury - Quicksilver Black Diamond Bravo Two Propeller 19.5" Diameter x 13" Pitch Left-Hand Rotation 3 Blades Aluminum Black Finish 8M0155025. Overview. There is something special about the way a well-balanced propeller can make your boat feel. You ease forward on the throttle, and everything just flows-smooth power, quiet thrust, and total control. That is exactly what the Quicksilver Black Diamond Bravo Two Propeller (Part Number 8M0155025) delivers. It is built for boaters who value simplici