The new BZ-3 Ceiling Bezel is designed to accept various multi capsule ceiling microphones such as, the Polycom HDX - ClearOne ceiling microphone array - Audix M3 or another larger microphone. This Bezel also provides a new function that permits a final trim of the microphone when retracted inside the bezel. This adjustment trim can be performed from inside the room - using the Hook adjustment tool as shown below. Deploy the microphone out of the way, push the guide up to reveal the adjustment slot, engage the hook end into the limit switch carrier, push up to allow the microphone more entry or pull the carrier down to stop the microphone sooner. Try small increments until desired docking is achieved.