This is a A-P57928 Knife, Flail Mower, Heavy Duty PN: P57928Main Description As Following : A-P57928 Knife, Flail Mower, Heavy Duty PN: P57928 Found in Section & Models : Hay Tool Parts > Flail Mower Parts, John Deere MOWER, FLAIL: 360 (Qty: 54), John Deere MOWER, FLAIL: 370 (Qty: 66), John Deere MOWER, FLAIL: 390 (Qty: 84) Associated Items : New Also This is An Aftermarket Product And : Hole Size: .750" Length: 3.228" Thickness: .250" Width: 2.000"