This is a A-806-0620 Round Bore Implement Yoke (w/ Double Keyway & Set Screw) PN: 806-0620Main Description As Following : A-806-0620 Round Bore Implement Yoke (w/ Double Keyway & Set Screw) PN: 806-0620 Found in Section & Models : Driveline > Driveline Components, Weasler Domestic: 6 SERIES, Driveline > Yokes, Weasler Domestic: 6 SERIES Associated Items : New Also This is An Aftermarket Product And : 6 series implement yoke, 1-1/4" round bore with 1/4" & 5/16" double keyway with set screw. Original Weasler part. Bore: 1 1/4" Double Keyway: 1/4" & 5/16"