It got to the point where my WELLS 600 bandsaw began to oscillate and drift instead of cutting straight regardless of blade tension. She's an old bird. 1950s or earlier. WELLS still offers parts and makes the exact same models. But new stock from them or suppliers was a bit cool for me. So after some research I settled on them as an inexpensive replacement. They are slightly thicker, but all other sizes are the same. Compared to my worn factory original bearings. They are amazing. The saw now cuts straight and correctly. In terms of fit, finish and feel, they are great. Longevity is good, they were only there for 40 minutes and I only had them for 50 minutes. Today is May 26th, 2020. So if this review isn't edited, they're still working. I expect they will last for many years.