Features: 1Applicable Model: Boat motor propeller replacement for 8?20HP outboard engines. Fit for 2 1/2in Gearcase. Fit for DF8A DT9.9 DF9.9 DF9.9A DT15 DF15 DF15A DF20A. 2Low Resistance: The aluminum alloy propeller blade has 3 sharp blades, and the blade profile is subject to almost zero resistance when propelling underwater, which can quickly cut the water surface and advance forward. 310 Splines Teeth: The propeller blades are linked by 10 spline teeth, and the spline teeth are forged from high?density pure copper, which better matches the speed of the engine, allowing your yacht to charge faster on the water. 4Seawater Resistance: The surface has been painted, which is smooth and clean, and resistant to salt. Even if it is immersed in seawater for a long time, the propeller blades will not be damaged. 5Positive and Negative Rake Design: 9 1/4in diameter x 10in pitch, positive rake benefits from normal bow lift to permit the use of a larger diameter propeller, while negative rake can provide extra blade strength for use in very high speed applications. 6Excellent Performance: Excellent bow lift, acceleration as well reducing slip, increasing bite. A cupped propeller will exhibit very high efficiency at high speeds as well as minimize cavitation under heavy loads. Package included: 1 x Outboard Propeller&nbsp