Mercury - Black Max 3-Blade Extra Cup Aluminum Propeller 12.5" Diameter x 8" Pitch Right-Hand Rotation 3 Blades Aluminum Glossy Phantom Black Finish 42738CP1. Overview. There's a reason so many boaters swear by the Mercury Black Max propeller-it's dependable, smooth, and built to take on whatever the water throws at you. The Black Max 3-Blade Extra Cup Aluminum Propeller brings that same reliability but adds a little more bite, giving your boat the extra lift and control it needs-especially for