Description Fits Craftsman, Yard Machines, Murray, Ryobi, Poulan, Troy-Bilt, Bolens, Huskee, Yard-Man and Lawn-Boy mowers. Includes hardware. See part number RS-12 for replacement dethatching springs. Metal dethatching springs converts rotary mower into a 16" dethatching blade. Dethatches and grooms lawns, allows lawn to breathe, loosens and removes dead grass, and allows moisture and fertilizer to penetrate grass roots. Allows new seed to root and grow. WARNING: This product can expose you to chemicals including Lead which is known to the State of California to cause cancer, birth defects or reproductive harm and Butyl Benzyl phthalate (BBP) which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov