Mulching Blade Width: 2 1/2 ", Center Hole: 11/16 ", Has round center hole and is interchangeable with OEM blades with star shaped center hole for this application, Packaging Type: Branded label, Thickness: .203 ", Length: 19 1/2 ". Replaces Part Numbers: John Deere M154158, John Deere M112991, John Deere AM141040. Stens Part Number: 330-736