QualityParts From Oregon That you can depend on. Center hole: 9/16": Tungsten carbide is “fused” into the blade – creating an ultra-hard layer at the cutting edge and increasing the time between sharpening.; X-Tended Cutting Length™ optimizes the cutting efficiency with each revolution.; Gator Mulcher® provides cleaner, more efficient cutting performance that can eliminate the need to bag, saving time and hassle.; High-lift: The aggressive blade angle increases air flow to push debris up-and-out for superior bagging or side discharge.; Replaces major brand: Everide; Oregon Equipment Parts 592-608 Blade Everride Gator G5