Mobotron Under-desk keyboard clamp tray is designed to be fit different types of flat desk for multiple purposes. The metal clamp is made of durable and sturdy metal, which can be securely fixed on any desk up to 40mm(1.57in). The plastic tray can be a great working platform for keyboard, tablets, laptops, and other electronic devices. The sliding rails on both sides of the tray allow full adjust-ability with smooth movement. The tray can easily be stored under the desk while not in use.