Hustler (Registered Trademark) Aluminum 3 Blade Props for 40-150hp Engines with 4.25 in. Gearcases. Boasting the same race-proven geometry as Turning Point's stainless steel propellers, Turning Point Hustler aluminum propellers resist blade flex to deliver both improved fuel economy and performance. Under acceleration, tuned exhaust vents in the prop barrel reduce water density around the blades to produce faster hole shots and higher horsepower. Stainless steel performance at aluminum prices. Prop blades resist flex for improved fuel economy and performance. Tuned exhaust vents improve hole shot. Squeeze casting adds strength that boosts performance. Protected by five-step powder-coated finish. Propellers fit Evinrude (Registered Trademark), Honda (Registered Trademark), Johnson (Registered Trademark), Mariner (Registered Trademark), Mercury (Registered Trademark), MerCruiser (Registered Trademark), Nissan (Registered Trademark), OMC (Registered Trademark), Parsun (Registered Trademark), Suzuki (Registered Trademark), Tohatsu (Registered Trademark), & Yamaha (Registered Trademark) Outboards and Sterndrives. Uses 500 series Installation/hub kits only-Sold separately. See application chart for engine application information and required Installation/hub kit part numbers. Turning Point Hustler aluminum props function just like Express stainless steel designs and run within 0.5MPH to 1MPH of each other most of the time. There are many reasons for this:- Hustler props are produced from the same stainless steel geometry & drawing.- Hustler is cast using the latest state-of-the-art squeeze casting technologies. The competition does NOT use stainless steel blade geometry with no-blade-flex squeeze cast technology in their aluminum propellers. Competitive Die-Cast aluminum propellers significantly under perform when compared to stainless steel designs seen in the market. The 3-Blade Hustler is great for boaters looking to get the most top end out of their boat, and offer excellent bow lifting capabilities. 4-Blade props accelerate faster, exhibit stern lift, handle rough or following seas better, and maintain speed better as you load the boat down with gear or people.