FOR BIG ENGINES WITH BIG PROP SHAFTS.Engineered for Mercury applications using a 1.25†Prop Shaft. For the first time Mercury® Verado® or ProXS® engines with larger prop shafts now have access to Turning Point Propellers’ sought-after high performance Express stainless steel line of propellers (Hustler aluminum propeller housings are also compatible). FOR ENGINES OVER 150-400+HP WITH 4.75-5.44†GEARCASES. See application chart for engine application information and hub part numbers.