K&M 23900

This product is not cheap considering you'll have one for each mic stand.
For quickly changing microphones in a very dynamic field such as the once I'm working for it's an invaluable tool BUT it shakes a lot, the microphone inserted becomes dead unstable, that's not ok. I've had to fit electrical tape all around to have the screws fit properly then once you do it with tape it's hard to get the system working, I've had to remove the system from my working rig unfortunately, it would have been a brilliant idea if it worked.

I have about 35% trust in these and i would never mount a mic upside down using this and neither should you. Ever.
Otherwise.. good?