6 Functions In 1; Dethatch, bag, rake, scalp, mulch or cut! Universal fit for most 21" & 22" gasoline powered walk-behind lawn mowers. Tools required for installation: Socket Wrench, Box Wrench. Installation, usage, and safety instructions are included in package. Universal Fit for: Bolens, Bolens Premium, Brute, Honda, Huskee, Husqvarna, Lawn-Boy, Mastercraft, MTD, MTD Gold, MTD Pro, Murray, Poulan, Poulan Pro, Rally, Roper, Sears Craftsman, Snapper, Stanley, Toro, Troy-Bilt, Yard King, Yard Machines, Yard-Man, Yard Pro, Yardworks. Does not fit Honda Harmony Models, Lawn-Boy BBC models or Toro recycler models with Atomic Blade.