These basic O rings are great for so many things. These are not welded, and some are a bit open. If you need to open them further, or close them completely, you can do so with a pair of pliers (cover the pliers with masking tape to prevent scratching the finish). The opening is 5/8" in diameter, overall measurement is 13/16" in diameter, the metal itself is 2 mm thick. Nickel finish.
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