Oregon 98-056 Mower Blade, 14-13/16" 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