Michigan Wheel Marine 9 1/4 X 8 A3R PROP boat propeller operates by propelling the boat in the opposite direction by pushing water. It converts rotational energy into thrust; as a result, the spinning propeller raises water pressure to its rear and advances into the area of reduced pressure in front of the propeller, dragging the boat behind it. The forces at work follow Newton's third law. This propeller propels the vessel forward by pushing the water backward. It has a diameter of 9.25 inches and has a pitch distance of 8 inches per blade revolution. It is a little bit lighter with a mass of 3.0 pounds. That makes it more convenient to bring and is perfect to utilize in small boats. It has three blades intended for hurling. Its machine components contain aluminum contents. Key Features: It has the best rake inclination to keep the boat from vibrating too much. Anti-corrosion coatings protect metal surfaces by acting as a barrier, preventing chemical compounds or corrosive chemicals from coming into touch with them. Aluminum is light and flexible. Product Details: SKU: 102003 UPC: 014984004398 Weight: 3.00 LBS PITCH: 8 MATERIAL: Aluminum 14 ft-20 ft Heavy LoadEngine ApplicationHonda 8-20 Horsepower 21/2" Gearcase BF 8 TH 2000 & newer; BF 9.9 1988 & newer; BF 15 1991 & newer; BF 20 2003 & newer Yamaha 9.9-20 Horsepower 21/2" Gearcase 9.9 hp (2-Stroke) 1984-2009; F9.9 (4-Stroke) 2000 -07; 15 hp (2-Stroke) 1984-2009; F15 (4-Stroke) 1998 & newer; F15C 2007 & newer; F20 (4-Stroke) 2007 & newer Attaching Hardware:H63Attaching HardwareH63 Cotter pin: Nut (castle): Sierra: 18-3773