Adaptivergo Clamp-On Keyboard Tray, 30.7" X 13", Black Smooth movement slide-out tray puts your keyboard right where you need it, under your desk for improved ergonomics. Easy to install with sturdy metal clamps on any surface up to 1.5" thick. Impact resistant, plastic tray fits most standard and ergonomic keyboards. A great choice when under-desk cross bars, hardware, or other obstructions make permanent mount keyboard trays impossible to install. No screw installation does not damage the work surface.