This is an Interfit/Paterson Boom Arm Stand. It is a 5 section stand with a built-in boom arm. When used as a conventional stand it extends up to a height of 13' (4 m).
A built-in joint allows its top two sections to be converted to a boom arm with a 5' (1.5 m) extension. Its spring clips can hold your reflector disc in place, and the center pivot joint allows angle adjustment of the disc.