Question: [Fire steels](http://en.wikipedia.org/wiki/Ferrocerium), ferrocerium rods -- oversized versions of the "flint" in a lighter or torch starter, are an apparently popular survival/backwoods fire starting method.

* Why would one want one of these rather than a [Storm Lighter](https://i.stack.imgur.com/gmcYM.jpg)?
* Is one type or brand more effective than another?
* Sizes are [all over the map](https://i.stack.imgur.com/MMwc4.jpg). Do these all work equally well? Is it just a matter of lifespan?
* There are bare rods, rods on lanyards, and rods in handles. How does it matter?
* What is needed to make sparks with one of these rods? Will natural flint work as a striker?
* Do you "strike" or "scrape" a fire steel? How do you hold it?
* Can you use less sensitive tinder than is needed for a fire drill or fire piston?
* Are there any special precautions or specific failures for fire steels?

Answer: 
The big plus with a firesteel is that you can pretty much do what you want to it, including soaking the thing in ice cold water, and it'll still work as well as before. The big downside is it's just sparks, so it's harder to build a fire.

However, with practice, it's not that hard and does provide a good backup if your matches get soaked through and your lighter gets damaged.

In terms of specific questions:

* I have two or three brands and I see no discernible difference between them.
* The bigger the better - the thicker it is, the longer it will last before being worn down.
* Any flat blade will generally do the trick, though if you use a sharp knife bear in mind it'll get worn down quite quickly.
* I prefer rods on handles - it makes it a lot easier to hold whilst using.
* You scrape rather than strike, still relatively fast. However, I've found good pressure and angle is much more important than speed. When practicing, go slowly - you'll improve your technique and be surprised how many sparks you can create this way.
* No real specific precautions you need to bear in mind, just the general ones when you're dealing with fire!
I strike my fire steel with a piece of hacksaw blade. I have the added ability to either just strike/scrape the ferro rod, shave shavings off it into a tinder bundle to get more intense fire lighting sparks. I can use the striker to shave fat wood, or normal wood, which will in turn take less of a spark to ignite. I can attach a piece of paracord through the blades fixing hole so I can attach it to either the ferro rod, or keyring of some kind, or just to place as lanyard around the wrist for extra security so you don't use the striker when using. Also the teeth of the blade bite into the rod really well and will give you a lot of sparks with less effort, even when using cheaper harder material ferro rods that don't throw many sparks normally.