K & M Telescopic boom arm (2 piece) The industry standard; adjustable/telescopic boom arm T-bar locking mechanism Adjustable telescopic boom--18-Inch to 30-1/4-Inch Swiss steel tubiing It's easy to transport and is backed with a 5-year warranty! Boom arm 2-piece telescopic design Boom arm length from 17.126 to 29.331&#034; Clamping T-bar locking screw Material steel Threaded connector 5/8&#034; Type black Weight 1.41 lbs