QualityParts From Oregon That you can depend on. Center hole: 6 point star, 5/8": Requires 3 blades for 50" cut; The aggressive blade angle increases air flow to push debris up-and-out for superior bagging or side discharge; Stays sharp and durable for longer; Fits Toro models: GT2100, GT2200, LX500, SL500; ; Oregon Equipment Parts 98-097 Blade Mtd 942-0415A 17-7/8 I