Mercury - Black Max 3-Blade Aluminum Propeller 10.375" Diameter x 9.5" Pitch Right-Hand Rotation 3 Blades Aluminum Glossy Black Finish 19636A10. Overview. There's a certain kind of confidence that comes from knowing your boat will respond exactly how you expect it to-no hesitation, no surprises, just smooth control and dependable pull. The Mercury Black Max 10.375 x 9.5 Aluminum Propeller ( 19636A10) gives you that kind of trust every time you hit the water.. It's not about flash or bragging rig