This is a A-800-3523 Round Bore Implement Yoke (w/ Keyway & Set Screw) PN: 800-3523Main Description As Following : A-800-3523 Round Bore Implement Yoke (w/ Keyway & Set Screw) PN: 800-3523 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. 1-7/16" round bore with 3/8" standard keyway and set screw. Original Weasler part. Bore: 1 7/16" Standard Keyway: 3/8"