Mercury - Quicksilver Q4 Propeller 12.7" Diameter x 19" Pitch Right-Hand Rotation 4-Blade Stainless Steel 8M0055562. Overview. There is a special feeling that comes when your boat launches cleanly onto plane - no lag, no hesitation, just smooth, confident lift. The Quicksilver Q4 Stainless Steel Propeller (Part Number 8M0055562) delivers that feeling every time. Designed for boaters who want more than basic performance, this prop takes precision and power to the next level. With its aggressive 4