Shaft Coupler Body, FC30, Bore Dia. 1 7/16 in, 3/8 in x 3/16 in Keyway Size Type, Steel Material - Hubs, Outside Dia. 3 in, 5.47 in, Overall Length 5.47 in WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov - Nickel (Metallic)