The use of the A 20 is recommended if the solid-borne sound insulation should be better than with a rigid stand clamp.
The base has a 5/8"-27 NS internal thread with adapter for 3/8" and 1/2" included. A special clamp secures the microphone cable. This is necessary with the A 20 and advantageous with the A 20 S. The microphone can be tilted to any angle.
Since the facelift (2011), the A 20 has an unbreakable metal housing and a sturdy, non-scratching and unbreakable clip made of modern plastic.