20" universal blade. Universal 3-in-1 blade mulches, bags, and side discharges. Includes sizing hardware. Fits most Bolts, Craftsman, Huskee, Husqvarna, Lawn-Boy, MTD, Murray, Poulan, Snapper, Troy-Bilt, Toro, Weed Eater, Yard Machines, Yard-Man, and others. Blade Type: Walk, Length: 20", Center Hole: Universal, Type: 3 in 1, bag/mulch/side discharge No. 490-100-0081: Blade Type: Walk, Length: 21", Center Hole: Universal, Type: 3 in 1, bag/mulch/side discharge No. 490-100-0082: Blade Type: Walk, Length: 22", Center Hole: Universal, Type: 3 in 1, bag/mulch/side discharge