QualityParts From Oregon That you can depend on. Center hole: 13/16": Requires 2 blades for 36" and 38" cut; High-lift: Aggressive blade angle increases air flow to push debris up and out for superior bagging or side discharge; Enhanced hardening to keep the blade sharper and more durable; Made to exact OEM specifications; Replacement for major brand: Murray; Oregon Equipment Parts 97-107 Blade Murray 091742Ema 19-7/