Mercury - Quicksilver Q4 Propeller 13.5" Diameter x 15" Pitch Right-Hand Rotation 4-Blade Stainless Steel 8M0055560. Overview. There is a moment every boater lives for - that instant when the throttle hits, the hull lifts, and you can feel your boat come alive beneath you. It's smooth, powerful, and effortless. That's exactly what you get from the Quicksilver Q4 Stainless Steel Propeller (Part Number 8M0055560). It's designed for people who don't just run their boats - they feel them. The Q4's a