This is a A-800-1218 Round Bore Implement Yoke (w/ Keyway & Set Screw) PN: 800-1218Main Description As Following : A-800-1218 Round Bore Implement Yoke (w/ Keyway & Set Screw) PN: 800-1218 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: 1-1/8" Centerline To End: 3-1/2" Keyway: 1/4"