Mercury - Enertia ECO 3-Blade Stainless Steel Propeller 16" Diameter x 18" Pitch Left-Hand Rotation 3-Blade Stainless Steel Polished Finish 8M0151252. Overview. There's something special about the way a good prop makes a boat come alive. The Mercury Enertia ECO 16x18 Left-Hand 3-Blade Stainless Steel Propeller (8M0151252) isn't just another shiny piece of hardware-it's a prop you feel in your bones. The moment you throttle up, it grabs the water with confident bite and sends you gliding forward