This is a A-806-0518 Round Bore Implement Yoke (w/ Double Keyway & Set Screw) PN: 806-0518Main Description As Following : A-806-0518 Round Bore Implement Yoke (w/ Double Keyway & Set Screw) PN: 806-0518 Found in Section & Models : Driveline > Driveline Components, Neapco DOMESTIC: 0675 SERIES, Driveline > Yokes, Neapco DOMESTIC: 0675 SERIES Associated Items : New Also This is An Aftermarket Product And : Weasler alternative to original part. Bore: 1-1/8" Rd. Centerline To End: 2 1/2" Double Keyway: 1/4" & 5/16"