This is a A-P71716 Knife, Flail Shredder PN: P71716Main Description As Following : A-P71716 Knife, Flail Shredder PN: P71716 Found in Section & Models : Hay Tool Parts > Flail Mower Parts, John Deere MOWER, FLAIL: 200 SERIES, John Deere MOWER, FLAIL: 520 SERIES Associated Items : New Also This is An Aftermarket Product And : Hardened Hole Size: .750" Length: 4.646" Thickness: .312" Width: 2.504"