VERSATILE: This folding open rack fits 19 inches standard width equipment for network router, server, NAS, data, audio device. Vertical & horizontal mountable, compact design for limited space application as a network rack, audio rack, NAS rack, AV server rack, or even power equipment shelf. Size range 2U, 3U, 4U, 6U are to meet most applications. STURDY: Using qualified 2.0 mm thick cold rolled steel & 0.2 mm powder coating and reinforced back plate, created outstanding torsion resistance & heavy load.