Mercury - Bravo I 4-Blade Stainless Steel Propeller 15.25" Diameter x 28" Pitch Left-Hand Rotation 4-Blade Stainless Steel Polished Finish 8M0151216. Overview. There is a certain thrill that comes from a prop that truly connects you to the water - one that lets you feel every ounce of your boat's power without losing control. The Mercury Bravo I 4-Blade Stainless Steel Propeller (Part Number 8M0151216) delivers that experience in spades. It is the kind of prop that serious boaters and high-perfo