I recovered an ottoman and this was great for the job. I would say any project that you used this for with straight lines would work well, but anything with small curves, this would be impossible to use.
Plastic, not metal, but had no problems with them. They snapped together perfectly, and were not easily scratched or marred. I used doubled-up satin, however, so I'm not sure how a very thick fabric would work in these grommets.
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