MMF key cabinets are perfect for offices, auto rental companies, and other places wanting to keep track of lots of keys. Cabinet sizes vary from holding 30 to 320 keys. The single-tag key cabinet has a hook and tag for every key. When one is lent out, simply replace the key tag with a tag detailing who received it. Two key-tag units allow for two sets of keys to be kept organized. Place original copies in a separate compartment to ensure that is not lost while the copies hang in another section.