Hi there, this a multiple screen monitor stand. Below is the blurb from the manufacturer's website.
This is in excellent condition in original boxing. I'm freegling it as the monitors I had were not suitable for it (too large).
It would need to be picked up from Hammersmith Grove, W6.
Thank you for looking and please don’t hesitate to get in touch for any additional information.
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Ergotron DS100 Triple Monitor Desk Stand
https://www.ergotron.com/en-gb/products/product-details/33-323#?color=black

This is a heavy-duty desk stand to suspend three monitors on a single base to uncover more work area. View screens side by side for a productivity boost. Easily attaches to monitors that are VESA® compliant. Supports screens up to 21" and 31 lbs (14.1 kg).

• Multi-display stand - Position your monitors for comfort and productivity
• Medium size - Supports screens up to 21" and 31 lbs (14.1 kg)
• Saves space - Low-profile base opens up more work area
• Streamlined views - Slide screens into place so the edges align
• Stable platform - Durable steel construction locks in screens
• Stay organized - Cable management controls the cable chaos for a neat workspace

Double/Triple Computer Monitor Stand (Ravenscourt Park W6)