QualityParts From Oregon That you can depend on. Center hole: 3/8": Requires 1 blade for 22" 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; Replaces major brand: Murray; Oregon Equipment Parts 97-015 Blade Murray 042225E701Ma 21