2-5/8″ long, the other side looks the same except that it’s numbered 6 thru 10. It may look like the cryptic key that Robert Langdon tried to solve in Da Vinci’s code, but that’s not what it is. So what is it?
The website “What it is?” features a lot of rather obscure products like this, inviting visitors to guess their functions.
[Answer to the above question: It's a storage for welding electrodes - turning the knurled end piece reveals a separate chamber for each number.]