Gira E2 cover frame for flat installation Anthracite Anthracite - Shatterproof. - Using the Gira device box, the Gira E2 switch range can be installed flat on the wall. - For cavity wall installation, e.g. in a flexible wall system, this device box can be sunk directly into the wall. - For flush-mounted installation in masonry, the device box is inserted into a flush-mounted installation box and this is then embedded in the wall.