Mercury - Bravo Three Front Propeller 15.9" Diameter x 21" Pitch Left-Hand 4-Blade Stainless Steel Matte Finish 8M8022380. Overview. There is something deeply satisfying about feeling your boat respond exactly how you want it to. The Mercury Bravo Three Front 4-Blade Stainless Steel Propeller (part number 8M8022380) makes that connection seamless. Built for the Bravo Three dual-prop sterndrive, it is designed to pull heavy boats forward with quiet confidence and clean efficiency. You will notice