This is a A-10001-1060 Implement Yoke, 1 3/8" Round Bore, 5/16" Keyway, W/ Set Screw PN: 10001-1060Main Description As Following : A-10001-1060 Implement Yoke, 1 3/8" Round Bore, 5/16" Keyway, W/ Set Screw PN: 10001-1060 Found in Section & Models : Driveline > Driveline Components, Neapco DOMESTIC: 1000 SERIES, Driveline > Yokes, Neapco DOMESTIC: 1000 SERIES Associated Items : New Also This is An Aftermarket Product And : Implement Yoke. 1-3/8" Round bore with 5/16" Keyway with set screw. Yoke centerline is 2-1/2". Weasler alternative to original part. Bore: 1 3/8" Centerline: 2 1/2" Replaces: Neapco Part No: 10-4293 Single Keyway: 5/16"