So I bought a small box of tap wrenches, and it had a dollar general dial caliper in it, as well as this. The guy had no idea what idea it is, and neither do i, he seemed to think it had to do something with machining
The "roller has 2 textures and 3 different sized wheels that thread on.
its a keycron C2 with cherry browns, my old one started to die, the A key didnt work anymore :(. I really like the old keyboard look, something just so classic about it.