This is a A-510-0600 Slip Sleeve (w/ Grease Groove) PN: 510-0600Main Description As Following : A-510-0600 Slip Sleeve (w/ Grease Groove) PN: 510-0600 Found in Section & Models : Driveline > Driveline Components, Weasler Domestic: 6 SERIES Associated Items : New Also This is An Aftermarket Product And : Original Weasler part. Bore: 3/4" x 7/8" Rect. Fits Tube: 1 1/2" / .065 Wall Length: 4"