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.
Don’t know exactly, but it looks like deburring tool. Does it rotate in the handle?
Metal deburring tools have similar shape, but are smaller and blade is a blade. This looks like it would work on crumbly soft materials like wood or plastic.