QualityParts From Oregon That you can depend on. Center hole: 1/2": Requires 3 blades for 60" and 61" cut; Enhanced mulching for bagging and discharge efficiency; Stays sharp and durable for longer; Fits Bush Hog models: CZ2561, ERM, FTH, RDTH, TH, M2260, M2360, M2560, M2560K, M2261, M2361, M2561, M2561K, PZ2761KH3, PZ3061KH3; ; Oregon Equipment Parts 91-071 Blade Bush Hog 82324 21In[34