The ICY Dock ToughArmor EX MB491SKL-B 2.5" mobile rack is built for industrial small form factor systems that require exceptional drive security. It uses heavy duty metal construction, which is considered to already comply with flammability requirements and is capable of withstanding the harsh environments. The metal key lock prevents unauthorized access to your important drives and the thumb screw lock adds extra protection from impact which reduces drive tray vibration, increasing drive stability during transportation. The removable drive tray allows interchangeability of data between multiple systems. It is an ideal solution for enterprise level small form factor applications since it maximizes the use of space in industrial small PCs, surveillance, embedded systems, automation systems, aerospace systems and mobile DVR systems.