Tripp Lite SmartRack SRRAILDPTH1U Mounting Rail Kit for Rack Server, Rack Equipment, Enclosure - Black - 2

Increase or Decrease the Depth of Your Server Rack by 4 in.This SmartRack® rail-depth adapter kit lets you mount rack equipment so that it either extends four inches (10.2 centimeters) past the front vertical mounting rails or recesses four inches within the rails. This would benefit you, for instance, if you mounted extra-deep equipment that protruded out the front of the rack and prevented you from closing the door. Or it can allow you easier access to front cabling and help cut down on cable strain.