This single articulated arm with two sections is a great studio tool. The fully adjustable design has many uses, from lighting to gobos or whatever you can thing of. Top attachment with a 16mm spigot 3/8-Inch light attachment. Bottom attachment with a 16mm spigot (compatible with light attachment Superclamp) with 1/4-Inch thread. Arm tube diameters: 13mm.; attachment (bottom): color: black; load capacity at maximum extension: 3.31 lbs.; material: aluminum; maximum length: 23.82 in.; 2 sections; weight: 0.88 lbs.