Oregon Gator Mulcher 3-N-1 Lawn Mower Blade For John Deere 17-3/16-Inch High Lift 90-401 96-331 Replaces OEM No. AM39966, M86209 Blade length (measured diagonally): 17.2-inch Blade width 2.5-inch Blade center hole diameter 0.71-inch Width: 2.50in. And Thickness: .203in.