TFT Hemisphere I-BEAM Clamp - Hemisphere portable monitor/mount. 

This hard coat anodized aluminum and stainless steel clamp can be quickly attached to an I-beam and other objects, such as stair rails, by one person without the use of tools. The mount and clamp jaws can be moved to any of the 42 positions on the backbone for maximum versatility. Detented pins hold the mount and jaws in place and a travel stop keeps the pins attached to prevent them from being dropped or lost. Once the clamp is secured, the Hemisphere monitor is attached to the clamp by sliding the socket at the base of the monitor over the mount. The jaws can be removed and the backbone can be inserted into any standard 2" (51mm) hitch giving the ability to quickly add a monitor to most vehicles without costly modifications.