These basic little O rings are great for so many things. These are not welded, they have a split opening that has intentionally been left open. But can be easily closed tightly with a pair of pliers (cover the pliers with masking tape to prevent scratching the finish). The opening is 1/2" in diameter, overall measurement is 9/16"" in diameter, the metal itself is 1.5 mm thick. Nickel finish.
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