Oregon 98-057 Mower Blade, 16-1/4" 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