The Clamp Keyboard Drawer  is a solution to bring your keyboard
 off your desktop to a more ergonomic position. A clamp keyboard drawer
 is a great choice for those using  glass desks, or for desks where you
  keyboard tray mounting bracket.cannot be installed.
 
Specifications:

1. Keyboard Drawer 19" wide by 10" deep

2. Keyboard Drawer  clamps fit desks from .5 - 2.75" thick

3 Keyboard Tray slides under desk when not in use