This is an item I recently purchased (around September 2025). I used it to make holes in foam materials when creating foam sinkers, to insert weights. The usage period was short, and I haven't used it on anything other than foam (wood, plastic, etc.), so there is almost no wear or deterioration of the teeth. ● The photos show the actual item. ● I purchased it at a home center for about 800 yen. ● The larger tooth is about 5mm longer than the insertion part of a seaweed balance weight or a Deurner balance weight. You can make holes in the foam at the perfect depth. ● The smaller one is used for finishing adjustments of the holes. It can also be used as a regular carving knife. Thank you.