just measured the punch I have, the big ring is 13mm
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That's 4 rings bigger than the one i linked. What brand is it?
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googled, seems to be a Wolf

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I'm very pleased with the Victorinox Cigar Knife. It has three punches: 11mm, 8.5mm, 5mm (approximate diameters). While more expensive than some options, I feel it was worth the cost since it combines a knife and cigar punches.
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I've been doing a little research and since have a couple of these on order but it seems that this particular punch that ferdinand is offering makes the largest hole shy of making your own out of a bullet casing
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