QualityParts From Oregon That you can depend on. Center hole: 5/8": Requires 3 blades for 54" cut; 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: Toro and Exmark; Oregon Equipment Parts 94-070 Blade Toro 115-4999 18-3/4In