Mercury - Quicksilver Black Diamond Bravo Two Propeller 20" Diameter x 11" Pitch Left-Hand Rotation 3-Blade Aluminum High-Gloss Phantom Black Finish 8M0155023. Overview. Every boater knows the satisfaction of a smooth takeoff, the feeling of power transferring cleanly through the throttle, and the steady push that keeps you confidently on course. That's what the Quicksilver Black Diamond Bravo Two 20" x 11" Pitch Propeller (8M0155023) delivers a dependable blend of strength, control, and value.