Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 14.3" Diameter x 21" Pitch Right-Hand Rotation Three Blades Aluminum Phantom Black Finish QA1918X. Overview. There's something deeply satisfying about a propeller that simply does what it's supposed to - no overthinking, no complications, just smooth, consistent power every time you hit the throttle. The Quicksilver Black Diamond 3-Blade Aluminum Propeller is that kind of prop. It's the quiet workhorse of the boating world - dependab