This is a A-810-1216 Slip Yoke, Round Bore (w/ 1/4" Keyway) PN: 810-1216Main Description As Following : A-810-1216 Slip Yoke, Round Bore (w/ 1/4" Keyway) PN: 810-1216 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" Round Centerline: 5-1/4" Keyway: 1/4" Series: 12