X Arm, Extension and Collar Kit
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.

Benefits
Easily add a second arm to your LX desk mount to hold another monitor or laptop computer
Cable management feature routes cables under the arm, out of the way
Easy to use: Simple installation and effortless operation
Patented Constant Force™ lift-and-pivot motion technology
Passes Ergotron’s 10,000-cycle motion test, which ensures years of trouble-free height adjustment