Mercury - Bravo Four S Front Propeller 19.5" Pitch Left-Hand 4-Blade Stainless Steel 8M0167001. Overview. If you have ever spent a morning towing riders or surfing behind a Bravo Four S drive, you know how much the right prop matters. The Mercury Bravo Four S Front 4-Blade Stainless Steel Propeller (part number 8M0167001) is built to bring that effortless pull and clean wake feel to every ride. It grips undisturbed water with precision, turning every throttle movement into smooth, confident moti