This is a A-AA61722 Ball Bearing, Gathering Chain Idler Sprocket PN: AA61722Main Description As Following : A-AA61722 Ball Bearing; Gathering Chain Idler Sprocket P.N: AA61722 Bore: .669"Outside Diameter: 1.575"Width: .472" Stocked As: A-6203-2RS-I Found in Section & Models : Headers/Platforms/Feeder House > Corn Head Parts, John Deere HEAD, CORN: 606, John Deere HEAD, CORN: 608, John Deere HEAD, CORN: 612 Associated Items : New Also This is An Aftermarket Product And : High Quality Afternaket Shipped from Both US and Canada