QualityParts From Oregon That you can depend on. Center hole: 3/8": Requires 1 blade for 21" cut; Use with walk-behind mowers; Superior mulching for bagging and discharge efficiency; Enhanced hardening to keep the blade sharper and more durable; Fits John Deere models: JS60, JS61, JS 63, and 8800 Fairway mower; Replaces major brand: John Deere Oregon Equipment Parts 96-811 Blade John Deere Gator G3