Actually size is not the necessary factor if the weight and VESA meet the conditions, but you can still consider the size when you are choosing a monitor arm:

• Check the VESA pattern on the back of your monitor to make sure it matches the arm’s supported mounting standards.
• Check the weight of your monitor and ensure it falls within the weight capacity.
• Check the screen size(Not a necessary factor) to confirm that the arm is designed to support your monitor’s dimensions.

But please be aware that if the size of the monitor is too big, the adjustable height will be limited.

You can search the model of your monitor on GOOGLE and check whether it matches the VESA size of the monitor arm. And nowadays the VESA of the monitors is usually 75X75mm or 100X100mm, which matches the most of the monitor arms.

Our monitor arms typically include a clamp or grommet mount, and some models offer both installation options for added flexibility.

• Standard Clamp Mount: easy to install and remove without drilling, ideal for desks with accessible edges.
• Topside Clamp Mount: Tool-free installation from above the desk surface—no need to crawl under the desk.
• Grommet Mount: Provides a cleaner, more permanent setup by securing through a desk hole.

Some models also support wall mounting—a great choice for saving desk space or when mounting directly to the wall is preferred.

• Gas-Spring Arms: use internal pressure for effortless movement, ideal for frequent adjustments.
• Mechanical Spring Arms: rely on friction or spring tension, often more budget-friendly while still providing smooth movement.

Yes, quality monitor arms are designed for regular adjustments.

• Check weight limits: Make sure your monitor is within the arm’s specified load range.
• Monitor arm will move if the spring tension is not suitable. Firmly hold the arm horizontally as shown and position the arm. Adjust tension screw using the supplied Allen Key as follows(click it):

The picture of guidence for adjusting tension

If you’re unable to move the monitor arm smoothly, it may be due to over-tightened
components. 

• DO NOT over-tighten the tension screw, or the monitor arm may not move.
• DO NOT over-tighten the screws behind the VESA plate, or you can’t move your screens.

• Make sure the desk mount is securely fixed. If using a clamp mount, ensure it’s tightly attached to the desk edge.
• Check for any worn-out or damaged parts, such as joints or screws, and replace them if necessary.

If your monitor droops or tilts, it may indicate that the tension settings are too loose. Retighten the spring tension (as described in Q7) to increase the tension and support the weight of the monitor.·But if the weight of the screen exceeds the load capacity of the arm，causing the screen to tilt or droop, we recommend you to buy another arm which can bear the screen’s weight.

• Adjust the screws behind each VESA plate to fine-tune the height.
• Reposition each monitor until both are aligned horizontally.
• Ensure both arms have identical tension settings for consistent positioning.