They got back pretty quick with this reply;
"I don't see why not.

I know people use them for Brass and stainless steel, to polish.

I dont know about deburring, or removing Slag on Steel.

The Drums are pretty small, so you can't put anything to big in it.

It always uses water. So that's no problem.

I don't see any reason you couldn't. It should work fine as long as the parts are small enough to move freely inside the barrel"