You're looking at a brand new triple hole punch for punching holes in watch straps or holes for lacing.
The distance between the centre (not the edges) of each hole is 6.4mm and the diameter of the holes on this punch are 2.2mm.
Its also great for making 2.2mm lace holes as well! This tool is made from steel, not cast metals, it will last years! Other sizes available.
Please note this listing is for a single size 7 triple hole punch, other items depicted are for illustrative purposes only.