This is a A-804-4418 Square Bore Implement Yoke (w/ Set Screw) PN: 804-4418Main Description As Following : A-804-4418 Square Bore Implement Yoke (w/ Set Screw) PN: 804-4418 Found in Section & Models : Driveline > Driveline Components, Weasler Domestic: 44 Series, Driveline > Yokes, Weasler Domestic: 44 Series Associated Items : New Also This is An Aftermarket Product And : 44 Series Implement Yoke. 1-1/8" square bore with set screw. Original Weasler part. Bore: 1 1/8"