DIY - zrób to sam

This rotary tumbler is quite simple to operate and gives an excellent finish to materials such as rocks, stones, coins, clean cartridges, polish brass, etc. It has a clear barrel with a locking bar closure. It is excellent for studio and small jewelry projects like gold and silver jewelry polishing.
https://www.jewelerstoolsmall.com/Jewelry-Rotary-Tumbler-121.html