When asking for the meaning of what might seem a phrase to you, it is important that you give the full sentence, if not paragraph, where you found this written.
" set in tumble" is NOT a phrase in English.
the full sentence would be, 'a cutlery set in tumble polish finish"
"tumble polishing" is a method of smoothing and polishing rocks, metal and glass, done with some abrasive material acting on the material, and lubricated with soap or some such.
Student or Learner