K&M 03-31-555-15 is a 5/8″ threaded washer to suit a variety of microphone stands.
Use this to help maintain a more secure fit of your microphone stand adapter (mic clip), keeping it in the correct position without needing to turn it around, and around, and around…
Being 5/8″ internal thread, it not only suits genuine K&M microphone stands, but just about any other brand of stand available in Australia.