Pretty bad. The inner diameter of 8 mm is actually more like 8.12 mm, which makes it almost useless for me. This varies greatly from camp to camp. They also have a fairly large chamfer on the ID, more so than other bearings of the same type I've seen - that may or may not matter. , some do not rotate at all. Some were immediately rusted quite badly (I understand removing the grease removes the rust protection, but the metal seems prone to rust). I wasn't expecting a size but they disappointed me a lot. They're so inconsistent that I'd have to throw away a significant chunk of them, I'd be better off paying double for better bearings. The bore issue is also forcing me to completely redesign my design to fit cheap bearings.
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