Letterboxes for receiving mail, letters and small packages. Card insertion slot, which is installed in a door, fence, partition, etc. Black painted steel frame that is installed superficially, and is fixed at the rear by screws (not included). Large envelope model. specs Letterboxes for receiving mail, letters and small packages. Card insertion slot, which is installed in a door, fence, partition, etc. Black painted steel frame that is installed superficially and fixed at the rear, using screws (not included). Large envelope model. It has a protective lid with a hinge. Total size: 364 x 17 x 71 mm (width x depth x height). Slot size: 327 x 24 mm (width x depth x height).