Mercury - Quicksilver Q4 Propeller 14.6" Diameter x 19" Pitch Left-Hand Rotation 4 Blades Stainless Steel Polished Finish 8M0103529. Overview. You know that moment when the throttle moves forward, and your boat doesn't just move -it launches? The bow lifts, the engine hums, and everything feels perfectly balanced between power and control. That's what the Quicksilver Q4 Stainless Steel Propeller (Part Number 8M0103529) delivers every single time. Designed for boaters who want that responsive lif