An auto-relock tumbler was a type of lock that automatically relocked itself after a short time if not opened completely or left unlocked. It was often found on safes and car doors.

The safe in the counting room of Vic Fontaine's casino had an auto-relock tumbler, making it difficult for the safe-cracking janitor Nog. (DS9: "Badda-Bing, Badda-Bang")

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