QualityParts From Oregon That you can depend on. Center hole: 11/16": 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; Replacement for major brand: John Deere; Requires 2 blades for 38" cut Oregon Equipment Parts 191-392 BLADE,JOHN DEERE 19-1/2 IN