The Flint or tinder-box or fire starter, all different ways of calling the same thing.
Tinder in tinder-box was discovered approximately 1000 years ago, with the advent of the discovery of metallurgy, was used to enter fire, pipe or tobacco leaves.
In the Middle Ages was replaced then by match.
More convenient and faster.
In the army and in survival instead, you continue to use today as it has extraordinary properties.
Through this tool, we are able to light a fire in any situation.
If the lock becomes wet, we would be able to light the fire.
The lock can also be used at high elevations.
Every survival kit should have this tool!