Up for sale is a single space security cover for use in covering up a single space piece of audio gear.  These used to be used all the time to keep people from messing with EQ settings but now you can use them to cover up DSP's or any single space device that has buttons or switches you do not want "adjusted".  I have many of these that were pulled from racks over the years and covered EQ's and X-overs.  They need a good home protecting someone else's gear.  any questions just ask.