Amita Aluminum Boat Propeller (Yamaha) High quality aluminum propeller. Universal blade design to fit wide variety of applications. Wide blade design works well with 4-stroke engines. Designed for outstanding acceleration and top speed. Tough heavy duty rubber bushing smoothes shifting and won"t slip. Exclusive Solas squeeze casting process nearly eliminates porosity making our aluminum propellers stronger and tougher than traditional die cast propellers. Solas aluminum propellers have 4 layers of paint applied using superior coatings and high-tech painting process to ensure excellent anti-corrosion performance. Attributes: Horsepower: 150-300HP Spline: 15 Tooth Diameter: 14-1/2 Pitch: 17" Blades: 4 Rotation: Standard (Clockwise)"