Here's something I pick up awhile back from Shark Tinderbox in the UK. It's called the 5in1 Bushkey.
It's listed uses are.
1. Ferro rod scraper
2. Traditional flint striker
3. Can opener
4. Bottle opener
5. A flat bit screw driver
The Bushkey with my Izula and Altoids flint and steel fire kit.
Getting ready to catch a spark using flint and some Mikweed Ovum as opposed to charred cloth.
As a ferro rod scraper
Can opener
Bottle opener
And lastly a screw driver
Out of all that it said it could do the can opener was the most difficult but it did work by leveraging through the can lid instead of cutting but it got the job done.
It now resides in my pocket attached to my ferro rod.