Mercury - Enertia ECO 3-Blade Stainless Steel Propeller 16" Diameter x 20" Pitch Left-Hand Rotation 3 Blades X7 Stainless Steel Polished Finish 8M0151256. Overview. When you spend long days on the water, every drop of fuel and every bit of smooth power matters. The Mercury Enertia ECO 3-Blade Stainless Steel Propeller (Part Number 8M0151256) was built for boaters who want to go farther, faster, and with less fuel burn. It's not just about getting from point A to point B - it's about the quiet co