This handy horizontal cross arm can be used to mount multiple flash heads or cameras to your tripod or stand for a variety of functions. The cross arm mounts to any column with a 3/8” thread & allows for up to two flash heads or cameras or a combination of one each to be attached to its two horizontal sliding mounts. Each sliding mount features a 3/8” thread. There are two more mounts at each end of the cross arm, one ¼-20 & one 3/8” for more mounting options. An additional ¼-20/3/8” platform is also included. The cross arm can be used for a variety of purposes It will hold up to four flash heads for multiple flash setups. It can also handle cameras up to medium format allowing for easy & precise horizontal repositioning, or, for multiple exposures with a single camera for stereo photography. By mounting a camera to one of the end mounts, the cross arm can act as a copy st&. Perfect for when shooting tethered to a laptop while using with the Calumet Tripod Support Platform (CK7030) & i-Visor Pro LS Laptop Case (RM1902). The cross arm is lightweight aluminum, measures 24” (61cm) in length & weighs only 2.7 lbs. (1.2 kg).