QualityParts From Oregon That you can depend on. Center hole: 13/16": Requires 2 blades for 40" cut; Heavy-duty; High-lift: The 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; Superior mulching for bagging and discharge efficiency; Replacement for major brand: Murray Oregon Equipment Parts 97-119 Blade Murray 09187E701Ma -20