QualityParts From Oregon That you can depend on. Center hole: 5/8": Requires 1, Oregon® 91-917 blade and 1, Oregon® 91-918 blade for 48" cut; Rear discharge; Delivers left-hand cut; High-lift: The aggressive blade angle increases air flow to push debris up-and-out for superior bagging or side discharge.; Superior mulching for bagging and discharge efficiency; Enhanced hardening to keep the blade sharper and more durable Oregon Equipment Parts 91-917 Blade Walker 25In[524]