19" EIA 310-E Compliant. Horseshoe knockouts on the top and bottom of the enclosure allow already configured patch panels to be installed. 2 pair of #12-24 rails, fully adjustable; includes rack mtg. hardware. Solid Steel, Plexiglas, or Mesh Doors. 1, 2, and 3" conduit and horseshoe knockouts on top and bottom of rear section; 1, 2, and 3" on rear section. Full piano hinge provides added strength for rear section.