Mercury - Quicksilver Q4 Propeller 13" Diameter x 17" Pitch Right-Hand Rotation 4-Blade Stainless Steel 8M0055561. Overview. There is nothing quite like that instant connection between throttle and water - that feeling when your boat leaps forward with purpose, the hull lifts cleanly, and the ride feels effortless. The Quicksilver Q4 Stainless Steel Propeller (Part Number 8M0055561) delivers that every single time. Designed for boaters who live for control, precision, and the pure joy of a well-