Mercury - Enertia ECO 3-Blade Stainless Steel Propeller 16" Diameter x 20" Pitch Right-Hand Rotation 3 Blades X7 Stainless Steel Polished Finish 8M0151257. Overview. Some props just move your boat - others make it feel alive. The Mercury Enertia ECO 3-Blade Stainless Steel Propeller (Part Number 8M0151257) is one of those rare designs that changes the way you experience every run. You'll notice it the moment you throttle up - smooth, powerful, and efficient. It's the kind of prop that lets you s