These plates are standard 1in diameter and will not fit Olympic bars, I have had these plates for only about 3-4 months and they’ve worked great, I decided to wash them before selling them and it led to some surface rust on the weights, majority of this rust can easily be cleaned off except for a small chip in one of the plates shown in images. This issue will not affect any performance issues, they might just not look in pristine condition. If you have any questions or concerns feel free to message us!