VIVO dual vertical monitor mount (STAND-V002R). Use one stand to stack two monitors vertically to save desk space. Designed to hold most LCD monitors from 13" to 27" weighing up to 22 lbs, the STAND-V002R is made from high grade steel and aluminum. With integrated cable management, cords can be hidden and protected, and the mounting bracket offers open slots at the top so monitors can be mounted quickly and easily. Height-adjustable monitors and tightenable joints allow you to adjust how fluid/stationary you want everything to be.

Measurements & Compatibility:

It fits most LCD monitors between 13" and 27" in size
Each monitor can support up to 22 pounds
The mount uses VESA 75 x 75 and 100 x 100 mounting holes
There are 31.5" from the desk to the top of the center post, and the center post is 1.4" thick.
The mounting bracket is 3.25" in diameter and fits most standard desks

Features:

The tilt ranges from -45 degrees to +45 degrees
The swivel can be adjusted from -45 degrees to +45 degrees
360-degree rotation
Adjustable height
Cable management system integrated into the system
It is possible to install the monitor either in portrait or landscape orientation
Mounting options include both C-clamps and grommets (fits desks up to 3.25" wide)