The Icy Dock tough Armor EX MB492SKL-B dual bay 2.5\u201d mobile rack is built specifically for industrial small form factor systems that require exceptional drive security. It uses a rugged heavy duty metal construction, which is considered to be compliant with flammability requirements and is capable to withstand the harshest environments. The metal key lock prevents unauthorized access your important drives and the thumb screw lock adds extra protection from impact, and reduces drive tray vibration which increases drive stability during transportation. Our removable drive tray allows interchangeability of data between multiple systems.