Mercury - Enertia 3-Blade Stainless Steel Propeller 14.5" Diameter x 17" Pitch Left-Hand Rotation 3-Blade X7 Stainless Steel Polished Finish 8M0151234. Overview. There's something about the way a great propeller feels - that effortless lift when your boat glides onto plane, the clean response when you hit the throttle, and the steady pull through a hard turn. The Mercury Enertia 3-Blade Stainless Steel Propeller (Part Number 8M0151234) delivers that kind of confidence every time you're on the wa