This is a A-806-3520 Round Bore Implement Yoke (Double Keyway & Set Screw) PN: 806-3520Main Description As Following : A-806-3520 Round Bore Implement Yoke (Double Keyway & Set Screw) PN: 806-3520 Found in Section & Models : Driveline > Driveline Components, Weasler Domestic: 35 Series, Driveline > Yokes, Weasler Domestic: 35 Series Associated Items : New Also This is An Aftermarket Product And : 35 Series implement yoke. 1-1/4" round bore with 1/4" & 5/16" double keyway and set screw. Original Weasler part. Bore: 1 1/4" Double Keyway: 1/4" & 5/16"