Answer: padlocks

AnswerCrossword Clue
PADLOCKSSome need combinations to open them
PADLOCKSStudents' security devices
PADLOCKSChain securers
PADLOCKSCloses, as an establishment.
PADLOCKSBars officially
PADLOCKSSecures, in a way
padlocksdetachable lock with a sliding U-shaped shackle
padlocksto fasten with a padlock
padlocksPADLOCK, to lock securely