Maxpower 331045 Universal Replacement Lawn Mower Blade, 21-Inch Universal replacement blade Comes in 1-inch center hole Each blade includes a cover washer Also includes 6 reducing washers 3/8-inch, 7/8-inch, 9/16-inch, 5/8-inch and 13/16-inch Measures 21-inch length by 2.25-inch width