Middle Atlantic KDB-17.5 Knock Down 17.5" Shelf BottomThe Middle Atlantic Knock Down Rack Shelf Rack Bottom KDB 17. 5 is a heavy duty, rack bottom made from 16 gauge steel. It features a vented, bottom panel to promote adequate air flow and keep equipment cool. All assembly hardware is included with this item. *KDE rack ears must be ordered separately Key Features Convenient Functionality Use this economical accessory to add a bottom shelf to your existing rack or enclosure and better manage your