The König & Meyer 211/2 is a two-piece steel telescopic microphone boom arm. This exact 21120.577.55 Black variant has a 5/8-inch threaded connector.

Exact 21120.577.55 Black variant of the K&M 211/2.
Two-piece telescopic steel boom arm.
Manufacturer length range: 21.85–37.80 inches.
5/8-inch threaded connector.
Swivel joint secured with a large wing nut.
Boom arm only; vertical stand, microphone and clip sold separately.

The boom adjusts from 21.85 to 37.80 inches according to the current manufacturer specification. Its swivel joint permits angle adjustment and is tightened with a large wing nut.

Includes one boom arm only. The vertical microphone stand shown for context, microphone and microphone clip are not included.