QualityParts From Oregon That you can depend on. Center hole: 13/16": Requires 1 blade for 20" cut; For walk-behind mowers with a splined shaft; Superior mulching for bagging and discharge efficiency; Enhanced hardening to keep the blade sharper and more durable; Made to exact OEM specifications; Replaces major brand: MTD Oregon Equipment Parts 98-001 Blade Mtd 942-0620 20In[467]