6 Pack - Stens 320-040 Notched Air-Lift Lawnmower Replacement Blade for Grasshopper 320239 and Woods 70104, 70117 Pack of 6 Stens # 320-040 Notched Air Lift Blades Replaces OEM: Grasshopper 320239, Woods 70104 / 70117 18" L x 2 1/2" 0.250" thickness 3 blades for 52" decks