The propeller may need to be changed due to wear, corrosion, or damage. A bore reducer can repair the problem if the new propeller does not fit the shaft Anchor Bushing's 7/8" to 3/4"D Nylon Propeller Bore Reducer. Nylon bushings are designed for lower horsepower applications and smaller diameter propellers. This Anchor propeller bushing converts a propeller with a 0.875" bore to one with a 0.750" bore. Its long-lasting durability and value are assured by employing industry-leading materials and modern technology. This product is unrivaled in terms of quality. Key Features: Includes a brass stepping key Manufactured under SAE standards Extensively tested to ensure it can last for years Constructed to provide maximum strength and endurance It fits propeller shafts with a typical SAE taper Specifications: Brand: Anchor Bushing, Inc. SKU: NB1 UPC: NB1 Weight: 0.11 LBS Size: 7/8 to 3/4" Manufacturer Part Number (MPN): NB1 Diameter: 7/8" to 3/4" Material: Nylon Standard marine taper and come with brass step keys.