Mercury - Quicksilver Black Diamond Bravo Two Propeller 18.75" Diameter x 17" Pitch Left-Hand Rotation 3 Blades Aluminum Black Finish 8M0155029. Overview. There's a certain confidence that comes from running a propeller you know will perform-steady, smooth, and predictable, no matter what the day brings. The Quicksilver Black Diamond Bravo Two Propeller (Part Number 8M0155029) delivers exactly that kind of reliability. It's not about flash-it's about function. This prop gives you dependable thru