QualityParts From Oregon That you can depend on. Center hole: 5/8", 6 point star: Requires 2 blades for 38" cut; 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; Replaces major brand: MTD Oregon Equipment Parts 198-052 BLADE,MTD 19-5/16 IN