QualityParts From Oregon That you can depend on. Center hole: 15/16": Requires 3 blades for a 60" cut; Superior mulching for bagging and discharge efficiency; Enhanced hardening to keep the blade sharper and more durable; Made to exact OEM specifications; Tungsten carbide is “fused” into the blade – creating an ultra-hard layer at the cutting edge and increasing the time between sharpening; Replacement for major brand: Exmark Oregon Equipment Parts 492-730 Blade Exmark Fusion