QualityParts From Oregon That you can depend on. Center hole: 13/16": Requires 2 blades for 40" 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; Made to exact OEM specifications; Replaces major brand: Murray Oregon Equipment Parts 97-109 Blade Murray 091871E701Ma 20