Mercury - Trophy Sport 4-Blade Stainless Steel Propeller 10.625" Diameter x 12" Pitch Right-Hand Rotation 4-Blade Stainless Steel Polished Finish 878612A46. Overview. There's something special about a prop that responds instantly when you hit the throttle the kind that lifts your boat smoothly onto plane and glides across shallow flats like it's born for it. The Mercury Trophy Sport 4-Blade Stainless Steel Propeller (Part Number 878612A46) delivers that feeling every time. Built for bay and flat