Not much more than a novelty

It looks cool, and it does throw sparks, but requires a LOT of work. And a tiny piece of sharp metal isn't the most comfortable thing to have to grip for any extended period. Especially in any inclement weather. Just make things easier on yourself and wear a Ferro rod and striker, or use the 90° spine on your knife. This might help in a pinch, but just prepare yourself to drop some F-bombs.

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