They are slightly smaller than 1/4". I was going to use these to replace the grommets on the tent and the tent poles fit 1/4" grommets. They are smaller than standard 1/4" grommets. If you don't have exactly 1/4" sockets If you want inner diameters, they should work just fine. I was just a little annoyed that they were made in the USA and still couldn't get the right size. The ones I bought at a local sewing store were exactly 1/4 inch and made in Taiwan.
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