I've used it for cleaning brass, works excellent with stainless steel pellets, citric acid and water. Brass comes out like brand new. Or, it's one of the best rock tumblers you can find.  Star Diamond model TU 6&6 2 cavity model. It's crusty and dusty, and if you load it heavy, it might need a push to get it going. But it'll go for days with no problem, lots of life left in it. $80 cash, pick up in Menomonie area. 7one5 55six 95one9. Call /text.