This is a A-800-3522 Round Bore Implement Yoke (w/ Keyway & Set Screw) PN: 800-3522Main Description As Following : A-800-3522 Round Bore Implement Yoke (w/ Keyway & Set Screw) PN: 800-3522 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. 1-3/8" round bore with 5/16" standard keyway and set screw. Original Weasler part. Bore: 1 3/8" Standard Keyway: 5/16"