Maxpower 331980S 20" Universal Mulching Lawn Mower Blade: * Replacement lawn mower blade * Use for 20" cut mowers * Commercial gold metal mulching blade with sharpened cutting teeth for a cleaner, finer cut * Greater cutting surface for increased mulching * Centrifugal air lift design for uniform chopping distribution * 1" center hole with reducing washers in 3/8", 7/16", 9/16", 1/2", 5/8", and 13/16" * 20" blade