One of the important services banks offer customers is the provision of safe deposit lockers. The lockers come in different sizes and are used for safe keeping of valuables. Only the locker hirer or joint hirers can operate the locker.
If the hirer does not operate the locker (even though he pays rent) for a continuous period of one year (in case of a high risk profile) or three years (in case of a medium risk profile), the bank may ask the hirer to immediately operate the locker or surrender it.
It is important to keep locker keys safely as one could have to do a lot of paperwork if the locker keys are lost.