Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 9.9" Diameter x 11" Pitch Right-Hand Rotation 3-Blade Aluminum High-Gloss Black Finish QA3810R. Overview.. There's something incredibly satisfying about running a prop that just feels right the kind that gives your boat steady lift, smooth acceleration, and a confident sense of control no matter the water. The Quicksilver Black Diamond 9.9" x 11" Pitch Propeller (QA3810R) does exactly that. It's not about flash or overcomplication; i