Mercury - Bravo Three Front 4-Blade Stainless Steel Propeller 15.5" Diameter x 24" Pitch Left-Hand Rotation 4-Blade Stainless Steel Matte Finish 8M8022420. Overview.. Every experienced boater knows that smooth, confident power starts at the prop. The Mercury Bravo Three Front 4-Blade Stainless Steel Propeller (8M8022420) is engineered for those who expect steady control, effortless acceleration, and reliability that lasts season after season. Designed as the front prop in a counter-rotating Brav