The inner plastic cover are attached to inserts placed in the inside of the cabinet frame.
They can be beige or transparent.
The inner covers may be smooth or prepierced.

The inner cover used with DIN rail racks that are pre-pierced to the maximum number of modules that each cabinet can accommodate, so with a simple pressure may be removed the caps to the necessary amount of DIN modules to place.
In these inner covers can make the holes for the placement of signals, switches and allow access to controls placed on adjustable chassis.