Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 10.4" Diameter x 13" Pitch Right-Hand Rotation 3-Blade Aluminum High-Gloss Black Finish QA2106R. Overview.. There's something special about a propeller that feels dependable one that delivers smooth, predictable power every time you throttle up. The Quicksilver Black Diamond 10.4" x 13" Pitch Propeller (QA2106R) is that kind of workhorse. Designed for small Mercury outboards, it brings a sense of control and balance that makes boatin