Ergotron 97-940-026 LX Arm, Extension and Collar Kit, Height Adjustable Mounting Arm for Flat Panel Display and Notebook, Silver
Convert an existing LX Arm to hold two monitors, creating an LX Dual Stacking Arm configuration. This kit easily attaches to the pole of the desk mount base.
Recommended for use with the LX Desk Mount LCD Arm, Tall Pole.