Notched Hi-Lift Blade / Grasshopper 320245Pack Size:1Grasshopper 320245Dealer Choice 50-3162, J. Thomas BL-0003, NHC 212-1800, Oregon 91-531, Oregon 91-537, Rotary 13464Grasshopper Duramax decks, 9861 and 3461; Requires 3 for 61" deckLength: 21 ", Center Hole: 1/2 ", Width: 2 1/2 ", Thickness: .250 ", Heavy-duty