Specialty blade converts mower into a thatcher and power rake. Features ribbed blade for maximum strength and bolted-on carbon steel spring tines. Lock washers prevent springs from working loose while blade is in use. 16" blade allows Power Rake to be used on almost all rotary lawn mowers regardless of size. 1" center hole with 6 washers to fit mowers with 3/8", 1/2", 9/16", 5/8", 3/4", 7/8", and 1" diameter center hole hub.