QualityParts From Oregon That you can depend on. Center hole: 1/2": Requires 5 blades for 90" cut; Requires 7 blades for 124" cut; Low-lift; Fits Jacobsen models: AR-5, AR-522, and AR-722T; Superior mulching for bagging and discharge efficiency; Enhanced hardening to keep the blade sharper and more durable Oregon Equipment Parts 92-014 Blade Jacobsen 22-3/8In[431]