Maxpower 21-inch Universal mulching blade Maxpower 21-inch universal mulching blade is easy to use and install Fits most AYP, MTD, Murray, Sears, Snapper, and other mowers Includes reducing washer sizes 3/8, 7/16, 9/16, 1/2, 5/8, and 13/16 inches Measures 21-inches; model 331905