Arnold 60-Inch Side Discharge Lawn Mower and Tractor Blade Set Fits Bad Boy, Dixie Chopper, Dixon, Exmark, Gravely, Hustler 20-1/2 x 5/8 round center hole Replaces: 12421, 13956, 539119871, 53919747, 539129775, 9383, 08979600, 46999, 6180, 04699, 793794, 794685, 301-014, 315-511, 91-253, 92-037