VESA compatible. At the arm joins (and base) there are small Allen key type screws which will need to be tightened once the arm is put together. The base plate will easily fit a 20mm thick desk, and at a stretch 22mm.
eBay
Adjustable Single TV Monitor Mount Tilt Rotation Swivel Monitor Arm with Clamp & Grommet Base,Fits 13 to 32" TV/Computer Monitor
Aliexpress UK
Humanscale monitor arm with vesa plate and screws for the monitor white and silver in excellent condition
eBay
NB A6 Gaming Monitor Arm 27-50 Inch Curved Arc Screen Desktop Monitor Holder 2-18kgs Ultra Wide Monitor Mount
Aliexpress UK
Humanscale M2.1 New Condition. Quantity available Suitable for Desk up to 25mm thick Check the other range of monitor arms in my shop, Humanscale, Ergotron, CBS,Ergo, CDM and other top brands up to 80% off prices compare with the official price list.
eBay
Monitor Stand Single Monitor Mount for 14 -34 inch Screens Load 10KG Height Adjustable Monitor Arm Computer Desk Mount Stand
Aliexpress UK
With a VESA size of 75mm x 75mm and 100x100 mm, this monitor arm is perfect for organizing and positioning your monitor for optimal viewing comfort and efficiency. Quality single monitor arm, manufactured from aluminium.
eBay
Single Monitor Mount Bracket for 14″–32″ Screens, Height Adjustable Monitor Arm with C-Clamp, Home Office Monitor Stand
Aliexpress UK
The Humanscale M2 bolt-through monitor arm with VESA plate is a sleek silver desk mount designed to hold and adjust a single monitor. With the ability to tilt and rotate, this versatile stand allows for convenient viewing angles and helps to promote a more comfortable and ergonomic work environment. The trusted Humanscale brand ensures quality and durability in supporting your monitor securely and seamlessly. One of the clips to hold the cable in has broken (does not effect its operation. Also the plastic has been sun faded. Selling as no longer needed.
eBay
Single Monitor Mount for 13″–32″ Screens, Height Adjustable Monitor Arm with C-Clamp & Grommet Base, Home Office Monitor Stand
Aliexpress UK
Humanscale M2 Monitor Arm. Have marks scratches from previous use
eBay
Adjustable Single Monitor Mount, Tilt Rotation Swivel Gas Monitor Arm, with Clamp & Grommet Base,Fits 13 to 32" Computer Monitor
Aliexpress UK
I’m good working condition.
eBay
Desktop Triple LCD Monitor Three Hex Arm Monitor Mount Stand Adjustable 3 Screens Fit for 10"-27" Max Support 10KG MONITOR HOLDE
Aliexpress UK
Humanscale 3 monitor arm in good working order. Please note it can be fitted on thin desks. The gromit opening is about 4 CM wide. Perfect for productivity and streaming setups. COLLECTION ONLY from EAST LONDON
eBay
Single Monitor Mount Bracket for 14″–32″ Screens Height Adjustable Monitor Arm with C-Clamp Home Office Monitor Stand
Aliexpress UK