This Back Light Boom attaches to the shaft of most light stands with diameters of 19, 20, 25, and 28mm. The top tube diameter: 25mm 3 sections boom arm complete with Pivoting Clamp 124, Counter...

Pivoting Collar With Adjustable Lever Handle -Allows the stand to be easily used as either a standard light stand or a boom arm Chrome Plated Steel Construction with Square-end Legs -Enables the boom arm to...