The falcon eyes cbh-12-2 clamps allows you to convert your light stand into a background system suitable for hanging up to 2 background rolls. In order to hang a background roll from the cbh-12-2, a bracket set such as the falcon eyes b-reel, must be purchased and used in conjunction therewith. Alternatively, 2 crossbars can be used to hang your desired background. Each clamp has a length of 18cm and can be mounted upon any universal light stand. If you wish to use 2 background rolls with this set, a sturdy light stand will need to be used. Please see the optional accessories tab below to view the compatible options. Please note: the light stand, crossbar and roll holders shown in the photos are not included with the cbh-12-2.