1.The package include 3 pcs under desk storage,6 pcs screws.Each under desk storage shelf internal 3.4" long,2.4" wide,1.69" tall.The screws are made of premium stainless steel,screw installation and fixation, the connection is more reliable, to avoid the loss caused by loose fixation. 2.The under desk laptop shelf is suitable for laptop or some devices less than 2.4" thick, The width between the bracket can be adjusted freely according to your needs, so it is perfect for Portable Laptop, Cable Boxes, Modems, Wi-Fi Router, etc 3.1.Easy to Install: 1. Measure the device size. 2. Push the laptop holder to the bottom of the desktop (proper position). 3. Install the screws. 4.Shake it, check the product to make sure bracket is firmly before placing your devices on the bracket 4.Ergonomic size design:Our under desk laptop mount ergonomic storage solution is a minimalistic and stylish way to store your laptop under your desk, making the most out of the wasted space underneath 5.Adjustable width,not only for laptops: The width between the laptop holder can be adjusted freely according to your needs to adapt to different products, not only for laptops;Height fits laptops upto 1.5'' thick.