OC White 15000-18-13 - ProBoom Ultima Gen2 EPS 18-Inch Tall 4-Way Modular Clamp Base AssemblyProBoom Ultima Gen2 EPS 18" Tall 4 Way Modular Clamp Base Assembly is the backbone for our modular support system for mic booms and monitor arms. From this solid base, several custom clamps can be attached to support an array of adjustable arms. Typically the clamp base is attached to a table or counter top, but it can also be used as a ceiling mount by appropriate installation, and PMB Bracket Reverse Install Contact O. C. White for more information.