Check the listing for details. ProX XS-RSS2U Two Unit 2U Rack Rails for ProX Controller Flight Cases. Condition: New. Listed at 9.99 USD. The ProX XS-RSS2U two unit 19" rack mount utilizes space below the controller. This is perfect for rack mount gear such as wireless mic systems, power strip, drive rack, or storage drawer. The mounting hardware allows for front or rear rack mounting and can also be used to mount lightweight gear underneath the sliding laptop tray of most ProX cases. Adheres to the EIA-310 standard for 19" rackmount equipment.ProX has been manufacturing quality flight/road cases and accessories since 1984, and all are designed to protect your investment. ProX XS-RSS2U Two Unit Rack Rails Features:2U Rack Rail Hardware.EIA-310 Standard.Includes 4 Mounting Screws.Includes 8 Rack Screws.Quality Steel Construction.One Year Warranty. Each XS-RSS2U Retail Box Includes:(2) ProX XS-RSS2U Two Unit Rack Rails(4) Mounting Screws (8) Rack Screws