This is a A-804-0612 Square Bore Implement Yoke (w/ Set Screw) PN: 804-0612Main Description As Following : A-804-0612 Square Bore Implement Yoke (w/ Set Screw) PN: 804-0612 Found in Section & Models : Driveline > Driveline Components, Weasler Domestic: 6 SERIES, Driveline > Yokes, Weasler Domestic: 6 SERIES Associated Items : New Also This is An Aftermarket Product And : 6 series implement yoke, 3/4" square bore and set screw. Original Weasler part. Bore: 3/4"