QualityParts From Oregon That you can depend on. Center hole: 6 point star, 11/16": Requires 1, Oregon® 98-056 blade and 2, Oregon® 98-057 blade for 46" cut; Center blade for 600 and 800 series; Superior mulching for bagging and discharge efficiency; Enhanced hardening to keep the blade sharper and more durable; Replaces major brands: MTD and Troy-Bilt; Oregon Equipment Parts 98-056 Blade Mtd 942-0543 14-13/16I