This is a A-800-4423 Round Bore Implement Yoke (w/ Keyway & Set Screw) PN: 800-4423Main Description As Following : A-800-4423 Round Bore Implement Yoke (w/ Keyway & Set Screw) PN: 800-4423 Found in Section & Models : Driveline > Driveline Components, Weasler Domestic: 44 Series, Driveline > Yokes, Weasler Domestic: 44 Series Associated Items : New Also This is An Aftermarket Product And : Original Weasler part. Bore: 1 7/16" Standard Keyway: 3/8"