These do work on 1" threaded barbells, ez-curl bars, etc. But, they do not hold as solidly as the spring collars do. They can slip on and off the barbells even when you have them locked. They will not slide off easily, but if you pull them or if the weight plates were to slide against them, then they will move. So, if you are going to use these, definitely don't overdo it with the amount of weight because they can slide off and cause a major problem if the weight plates were to fall off. Using smaller plates, even several smaller plates (5-10 lbs) are not an issue, and realistically using 20 lb plates or even one 45lb plate on each side with these would not cause a problem. But, if you were to use multiple 45lb plates, that could be an issue.
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