This is the Simpex 009 Wall Mounted Black Boom Arm. Unlike the Auto Boom, which may be attached to a wall or a stand, this boom arm must be attached to a wall. It telescopes out from 1.2 - 2.1 m long.
You can mount studio light with soft box and make it a butiy light.
One extended arm
Arm holding bar (to be mounted on wall by screw)