This Rottner mailbox system is designed for 4 apartments, with each of the 4 individual compartments equipped with 2 keys. Made of 0.8 mm thick steel sheet, it features a name tag holder and is suitable for multi-family homes or residential complexes. Each compartment is secured with a cylinder lock. The letterbox system has a one-sided insertion slot, inclined downward, accommodating up to size DIN C4 (width x height) 330x20 mm. Its external dimensions are 600x385x140 mm (HxWxD), and internal dimensions are 270x380x60 mm (HxWxD). The letterbox system is equipped with 4 holes on the rear panel, and appropriate mounting materials are included in the delivery.