QualityParts From Oregon That you can depend on. Center hole: 3/4": Requires 1, 91-723 blade and 1, 91-701 blade for a 38" cut; Enhanced hardening to keep the blade sharper and more durable; Made to exact OEM specifications; Replacement for major brand: Massey Ferguson and Simplicity; ; Oregon Equipment Parts 91-701 Blade Simplicity 22-1/4In[493