3 Pack - Stens 320-040 Notched Air-Lift Lawnmower Replacement Blade for Grasshopper 320239 and Woods 70104, 70117 Pack of 3 - Stens 320-040 Notched Air-Lift Blade Replaces OEM: Grasshopper 320239 ; Woods 70104 / 70117 Fits Grasshopper 3452, 6052, 6152, 9052, 9252, 9352, 9552, 9652 and 9852 (REQUIRES 3 BLADES FOR 52" DECKS) Length: 18" x Width: 2 1/2" Center Hole: 1/2" ; Thickness: 0.250"