Works well with the poor quality spacers that come with the kit (very flimsy and flimsy, can't break through effectively and will hold 4 layers of 13 oz (thin) banner vinyl - which is standard for the corner banners). We have tried a few 3/8" grommets from other manufacturers and they will NOT fit this punch. We'll probably throw the stamp away since we can't find the right grommets that work with it.
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