Mercury - Black Max 3-Blade Aluminum Propeller 7.8" Diameter x 7" Pitch Right-Hand Rotation 3 Blades Aluminum Glossy Phantom Black Finish 812949A02. Overview. There is something special about a prop that just works - smooth, steady, and always ready when you are. The Mercury Black Max 3-Blade Aluminum Propeller is one of those pieces of gear that quietly does its job every single time. It is designed for smaller Mercury outboards, giving your boat that confident push and clean handling that make