Didn't realize it would be cardboard, but functions well and has held up fine for the first few months. Seems to be sturdy under the weight of my small monitor.
I have had the older Ergotron single monitor arms, but this one does not have a locking system to hold a monitor in place. It uses a spring-loaded mechanism to counter the weight of the monitors. Since I was using 2 Dell 2007FP's with 1600 x 1200 resolution - these are apparently too heavy for such a mechanism without a hard locking system, so beware. I managed to support the arms by using hose clamps over rubber tubing to solve the problem - unsightly, but it works!
The arm fit perfectly. I mounted the post portion on the desk and then mounted two 24 inch monitors on the arms. It took a bit of work balancing everything but when they slipped together, they worked right away. A quick adjustment of the monitors and I have a pair of matching monitors.
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