"Disc has a 1in. bore and keyway for live axle mounting. Fits our #13833 brake assembly shown, not included. U.S.A. Bore Diameter in. 1, Keyway in. 1/4, Disc Diameter in. 8, Application Brake disc. 1 3/4in. Hub diameter 3/4in. Collar 1/8in. Thick 1/4in. Square keyway in a 1in. bore Works with brake assembly Item # 113833"
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