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 1" to 7/8" D Nylon Propeller Bore Reducer (NB3). There is a stepped-down key included to fit the propeller bushing. Nylon Bore Reducers are a simple way to correct a bigger propeller bore than the intended usage. This high-quality product exceeds industry standards with a well-balanced design and superb artistry. Its long-lasting durability and value are assured by employing industry-leading materials and cutting-edge technology. Unlike any other product, this one is guaranteed to be of the highest quality. Key Features: Constructed with optimum strength and durability in mind Extensively tested to ensure that it can resist years of misuse Created with unmatched quality Shrink propeller bores to accommodate smaller shafts Designed for strength and endurance Manufactured under SAE standards Specifications: Brand: Anchor Bushing, Inc. SKU: NB3 UPC: NB3 Weight: 0.11 LBS Size: 1 to 7/8" Manufacturer Part Number (MPN): NB3 Diameter: 1" to 7/8" Standard marine taper and come with brass step keys.