Mercury - Quicksilver Black Diamond Bravo Two Propeller 19.25" Diameter x 15" Pitch Left-Hand Rotation 3 Blades Aluminum Black Finish 8M0155027. Overview. Every great day on the water starts with a prop you can trust. The Quicksilver Black Diamond Bravo Two Propeller (Part Number 8M0155027) delivers the kind of steady performance that makes boating feel effortless. It is smooth, predictable, and built to give you confidence in every condition. From quiet morning runs to long afternoon cruises, t