Vaults or strong rooms provide a secure space, typically within a bank building, for the storage of cash or other items of high monetary value.  There are three basic Underwriter’s Laboratory (UL) burglary-resistance ratings available for vaults: Type I, II, and III.  These are based on the time it would take to break into a vault using commonly available tools to compromise it, within 30, 60, or 120 minutes, respectively, for types I through III.  The ratings are achieved through actual demonstration tests by UL employees.  There is also a Type M 15 minute rating.