Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 14" Diameter x 23" Pitch Right-Hand Rotation 3 Blades Aluminum High-Gloss Black Finish QA1920X. Overview. There is something satisfying about hearing your motor hum and feeling your boat rise cleanly onto plane - that steady, confident push that tells you your prop's doing exactly what it should. The Quicksilver Black Diamond 3-Blade Aluminum Propeller delivers that kind of easy confidence. It's a prop you can trust to get you out an