Oregon Gator Mulcher 3-N-1 Hi-Lift Blade 19-1/2-Inch John Deere Lawn Mowers 96-309 Replaces OEM No. AM100946, AM100991, M82408, M83459, M84472, and M112991, AM37979, M112974, M118958, AM104652, M74449 Center Hole Diameter: 11/16in Blade Length (Measured Diagonally): 19-1/2in. Center Hole Diameter: 45/64in. Width: 2.50in. And Thickness: .203in.