can be freely adjusted according to your needs to adapt to different models and sizes of products, they are also not only for laptops; Suitable height for laptops up to 1.5 inches thick Guard Your Laptops: the felt boards are attached to the side of under desk shelf, so when you place your laptops, which can effectively protects the laptop from scratches and increases friction, preventing the laptop from slipping off Security and Stability: these under desk laptop holders are screw installation fixed, connected stability and security, avoid falling off caused by loose fixing. Space Saving: the under desk laptop mount is a great choice for people to use, mounting it under the desk, make full use of the space under the table, not only for laptop storage, but also keep your desktop clean and tidy, and you can access your computer at any time, it is also convenient for cable routing and laptop cooling Adjustable Range: the width between laptop rack mount What You Get: the package comes with 3 pieces of laptop under desk trays , ample quantities can meet your various usage and replacement needs, they are widely suitable for home, , school, library, study and so on