20 in Universal Gold Commercial Mulching Blade. Blade measures 20 in x 2-1/4 in with a 1 in center hole. Includes a cover washer and 6 reducing washers in the following sizes: 3/8 in , 7/16 in , 9/16 in , 1/2 in , 5/8 in , and 13/16 in . Blade features sharpened cutting teeth for a cleaner, finer cut, and a centrifugal air lift design for uniform chopping distribution. Also features greater cutting surface.