Bought these to replace the bearing on the lower guide for my band saw. After replacement less than two months ago and relatively little use, the bearing got stuck. Don't worry I have a 10 pack! Replaced the bearing today. After 1.5 hours of operation, the bearing stuck to my band saw again! I don't think these bearings are sealed very well with the sawdust getting to them in such a short amount of time. Wouldn't buy again. Now we are looking for a properly closed camp. Photo after sawing oak for 2 hours.