Oregon Gator Mulcher 3-N-1 Blade For 30-Inch John Deere Lawn Mowers 90-663 Replaces OEM No. AM101538, AM101539, M89454 and M89455 Order 1 for a 30-Inch cut Blade length (measured diagonally): 29-9/16-Inch Center hole diameter: 11/16-Inch Width: 2.50-Inch and thickness: 0.203-Inch