Mercury - Bravo I Propeller 15.25" Diameter x 30" Pitch Left-Hand Rotation 4-Blade Stainless Steel Polished Finish 8M0151218. Overview. There's a unique satisfaction that comes when you open up the throttle and your boat lifts effortlessly, tracking straight and true, cutting through open water like it was made for it. The Mercury Bravo I Propeller (8M0151218) gives you that feeling every single time. It's the kind of prop that's not just powerful - it's predictable, smooth, and perfectly in syn