The 21110B Telescoping Boom Arm from K&M is a classic tow-piece boom arm to be connected with any mic stand with a standard 5/8" thread. This solid boom arm offers silent, scratch-less swivel adjustment with the T-bar locking screw. The 211/1 extends from 18.5-30.3"(470-770mm). Plastic inserts at the joints assure a good fit while protecting metal finishes from metal-to-metal contact. Rubber washers and easy-to-grip knobs fasten booms securely in place. Proven clutch design ensures easy adjustment and positive locking. Backed by K&M's 3 year warranty, these items are guaranteed to perform!