QualityParts From Oregon That you can depend on. Center hole: 15/16": Tungsten carbide is “fused” into the blade – creating an ultra-hard layer at the cutting edge and increasing the time between sharpening.; Aggressive blade angle increases air flow to push debris up and out for superior bagging or side discharge.; Gator Mulcher® provides cleaner, more efficient cutting performance can eliminate the need to bag, saving time and hassle.; Replaces major brand: Exmark; Requires 3 blades for 46" cut; Oregon Equipment Parts 492-726 Blade Exmark Fusion