QualityParts From Oregon That you can depend on. Center hole: 7/8": Requires 3 blades for 60" cut; Fits Kubota models: RCK60B-23BX, BX2660, BX24, and BX7510; Superior mulching for bagging and discharge efficiency; Enhanced hardening to keep the blade sharper and more durable; Replaces major brand: Kubota; Oregon Equipment Parts 92-123 Blade Kubota K5371-97520 -20