This is a A-800-1220 Round Bore Implement Yoke (w/ Keyway & Set Screw) PN: 800-1220Main Description As Following : A-800-1220 Round Bore Implement Yoke (w/ Keyway & Set Screw) PN: 800-1220 Found in Section & Models : Driveline > Driveline Components, Weasler Domestic: 12 Series, Driveline > Yokes, Weasler Domestic: 12 Series Associated Items : New Also This is An Aftermarket Product And : Original Weasler part. Bore: 1 1/4" Standard Keyway: 1/4"