The On-Stage UM-01 Ball-Joint Adapter for U-mount Tablet Mounting System allows you to mount the u-mount Tablet Case to the TS9900 Travel-Ease Tripod Stand, the TS9901 Heavy-Duty Tripod Stand, or any microphone stand with standard 5/8"-27 threading. This adapter acts as a substitute for the mounting arms included with the TCM9150 Mounting System when their reach is not needed or desired. A machined steel ball joint allows for a rotation of 360deg. and a tilt of 180deg. This adapter is used for supporting a tablet computer for use as a conductor's stand, sheet music stand, lyric sheet, prompter, typewriter and remote mixer.