QualityParts From Oregon That you can depend on. Center hole: 7 point star: Requires 3 blades for 48" cut; High-lift: The aggressive blade angle increases air flow to push debris up-and-out for superior bagging or side discharge.; Superior mulching for bagging and discharge efficiency; Enhanced hardening to keep the blade sharper and more durable; Made to exact OEM specifications; Replacement for major brand: John Deere Oregon Equipment Parts 91-586 Blade John Deere Gx21785 -17