Mercury - Bravo I 4-Blade Stainless Steel Propeller 15.25" Diameter x 26" Pitch Left-Hand Rotation 4-Blade Stainless Steel Polished Finish 8M0151214. Overview. If you have ever pushed your boat to its limits on open water, you know the feeling - that moment when every turn, lift, and surge feels perfectly in sync. That's what the Mercury Bravo I 4-Blade Stainless Steel Propeller (Part Number 8M0151214) delivers. It is a prop that feels alive beneath your hands, steady under pressure, and built f