So you've never used them, but they don't work.
No, I used the first set. They were very poorly machined. That's why I sold the rest. They certainly do work if you don't mind having a scope with marks all over it, a ring that's pinching the scope, etc. If these were the only rings made, I'd make them work, but why use these pieces of junk when there are so many better quality rings out there?
