What category of lock uses a key like this?
Can these locks be picked? If so, what kind of tools are used?
Anyone know where I can see an illustration of the inside of the lock?
I'm not planning to pick the lock, just wondering what kind it is. I've been reading a lot about lock picking and haven't seen this type of lock mentioned yet.
The other side of this key has a similar groove.

Thanks for taking a look.