Oregon Universal Gator Mulcher 3-N-1 With Fusion Lawn Mower Blade For 22-Inch Blade 520580 Replaces OEM No. Blade length (measured diagonally): 21.8-inch Blade width 2.5-inch Blade center hole diameter 0.909-inch x 0.969-inch Outer hole:0.375 x 1.050-inch