QualityParts From Oregon That you can depend on. Center hole: 7/8": Reduces overall blade noise by up to 1.5 decibels; Clean cut for manicured look; Boron Steel Double Bevel blade provides the perfect balance between durability & ductility; Maximum mulching length; Requires 2 blades for 42" cut; To be used on Scotts mower Models made by Murray Oregon Equipment Parts 197-019 Blade Murray 21-3/16 In[476]