QualityParts From Oregon That you can depend on. Center hole: 13/16": Requires 2 blades for 42"cut; Replaces Murray "3 in 1 blade"; Superior mulching for bagging and discharge efficiency; Enhanced hardening to keep the blade sharper and more durable; Replaces major brand: Murray,; Oregon Equipment Parts 97-005 Blade Murray 056252E701Ma 21