This is a Sealmaster RP-27 ball bearing pillow block, possibly used some, but in good condition….appears to be a 1 3/4” opening size…measures 7 1/4” wide overall and about 4 1/2” high….will be shipped in a medium flat rate box unless you live in an area where I can ship with a regional rate box a little bit cheaper, and I will refund some of the shipping cost if that is the case .