Nine rack units mount to a wall in a 20.9 by 17.7 by 20.5 in Q235 steel frame rated at 150 lbs. The hinged section swings a full 180 degrees to open the rear panel for cable work and lifts off its pins during a build. Standard 19 in mounting width accepts switches, firewalls and AV components, M6 screws and cage nuts are supplied, and the whole frame weighs 14.11 lbs.