I did use mine actually "in the field" twice to work on knives, once I needed to precise cut some plastic sheeting but found the tip of my LM squirt too dull for a smooth job; another time I broke the very tip of my folder and spent some spare time filing out the new one (not that I was really needing it right away, but for an aesthetic reasons). But I can recall much more cases of using it as a metal and glass file.