This is a A-800-0618 Round Bore Implement Yoke (w/ Keyway & Set Screw) PN: 800-0618Main Description As Following : A-800-0618 Round Bore Implement Yoke (w/ Keyway & Set Screw) PN: 800-0618 Found in Section & Models : Driveline > Yokes, Weasler Domestic: 6 SERIES Associated Items : New Also This is An Aftermarket Product And : Yoke has 1-1/8" round bore with 1/4" standard keyway and set screw. Original Weasler Part. Bore: 1 1/8" Standard Keyway: 1/4"