QualityParts From Oregon That you can depend on. Center hole: 15/16": Requires 3 blades for 72" cut; High-lift: The aggressive blade angle increases air flow to push debris up-and-out for superior bagging or side discharge; Enhanced mulching for bagging and discharge efficiency; Stays sharp and durable for longer; Replacement for major brand: Exmark; Oregon Equipment Parts 92-057 Blade Exmark 24-1/2In[393]