Maxpower 21-Inch Universal Replacement Lawn Mower Blade 331045 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 331045 Blade width Blade width is 2-1/4-inches