Part # 24679 is an Omega Heavy-Duty Lawn Mower Blade. With a Cutting Length of 16 5/8", Width: 2 1/2", and Thickness: 0.2400", this Notched Air Foil / Bagging Style Lawn Mower Blade was designed to replace 173920, 180054, 532180054, 532 17 39-20, 532 18 00-54, 575938201, For Use on the Following Lawn and Garden Tractor Models: GT2548, LT2323A2, YTH2148, YTH2448, 917276022