Tumbler Tasks

Hi All,

I have been contemplating getting a tumbler for some time to do
various tasks–the main task would be to harden pieces and wire that
becomes annealed during the soldering process. Would a tumbler
accomplish that and which type and medium would you suggest? They
can get awfully expensive and I am confused about what details I
should want and which I can do without. Specific suggestions would
be greatly appreciated. Thanks.

Grace