Quick Release Keyboard Tray Assembly: Motion Attachment Option. - Heavy gauge steel base plate construction for long-term durability - Aluminum keyboard plate for reduced weight - Black powdercoat finish for maximum corrosion resistance - Keyboard plate features hole patterns: PDRC Keyboard, I-Key Keyboard and a Standard Amps pattern. - Keyboard can easily be removed using the latching lever in the back and allows for one-handed release - Keyboard can be comfortably placed on the operators lap for typing - When done keyboard snaps back onto the steel base plate with an audible click that indicates an engaged latch - Any Gamber-Johnson Motion Attachment can be attached to the bottom of the keyboard tray - Can be used with Tablet Display Mount (Item No. 7160-0494).