Atlas 21" universal 3-in-1 mower blade for mulch, bag and side discharge mowers. For walk behind lawn mowers and lawn tractors. Fits most Bolens, Brute, Craftsman, Husqvarna, Lawn-Boy, MTD, MTD Gold, Murray, Poulan, Poulan Pro, Remington, Snapper, Toro, Troy-Bilt, Weed Eater, Yard Machines, Yard-Man, Yardworks, White Outdoor, and others. Fasteners included. Installation, usage and safety instructions included in the package.