Create a Custom Boom Arm. Can be Cut to Required Length. Pre-Drilled for Attaching to Scaff Boom Arm. 1m Long Aluminium BarrelDiameter; 48-51mm Length: 1m. A pre-drilled 1.0m length of Aluminium Barrel which can be cut down to your requirements For use with the scaff boom arm.. lighting bar-aluminium barrel-scaff tube-scaffold tube