Rotary 9810 Mulching Blade Replaces: AYP/Roper/Sears: 159267, 165833, 175064, 175065, 189028, 191890X428, 194406X428, 406712, 406712, 406712X431, 532159267, 532189028, 532406712, 532437165 Husqvara: 532 40 67-12 Fits: 21" AYP Walk Behind Mowers Length 21";Width 2-1/4"; Center Hole DIA 5/8"; Thickness 0.1340"