Mercury - Bravo Four S Front Propeller 21" Pitch Left-Hand 4-Blade Stainless Steel 8M0167003. Overview. You know that perfect moment when the boat just feels dialed in - the pull is smooth, the response immediate, and the wake clean? That is what the Mercury Bravo Four S Front 4-Blade Stainless Steel Propeller (part number 8M0167003) is built to deliver. Designed for the Bravo Four S forward-facing sterndrive, it is made for surf boats and tow sport applications where control and balance mean ev