QualityParts From Oregon That you can depend on. Center hole: 6 point star, 11/16": Requires 2, 98-057 blades, and 1, 98-056 blade for 46" cut; Use as outside blades for 600 & 800 series; For deep deck mowers, 1996 and before; Enhanced hardening to keep the blade sharper and more durable; Made to exact OEM specifications; Replacement for major brand: MTD, Troy-Bilt Oregon Equipment Parts 98-057 Blade Mtd 942-0542 16-1/4In[