Mercury - Black Max 3-Blade Aluminum Propeller 8.9" Diameter x 8.5" Pitch Right-Hand Rotation 3-Blade Aluminum Phantom Black Finish 897618A10. Overview. There is something reassuring about a propeller that just does its job every time - no drama, no surprises, just dependable performance. The Mercury Black Max 3-Blade Aluminum Propeller (Part Number 897618A10) is one of those quiet workhorses that make boating feel effortless. It is the prop you can trust whether you're easing out from the dock