Mercury - SpitFire X7 4-Blade Stainless Steel Propeller 14" Diameter x 13" Pitch Right-Hand Rotation 4-Blade Stainless Steel Polished Finish 8M0151360. Overview. The Mercury SpitFire X7 14x13 Right-Hand 4-Blade Stainless Steel Propeller (8M0151360) is the kind of prop that makes your boat feel alive under your hands. From the moment you hit the throttle, it leaps forward with a burst of energy that'll make you grin. It's crisp, smooth, and responsive-everything you want when you're chasing perfo