PC1 letterbox for installation in and on walls. Also available as pre-assembled modules, e.g., for rented apartments PC1 is one of the most popular letterbox systems in Denmark and is suitable for installation in and on walls. The letterbox is made of steel, the letter slot is made of aluminium. The lockable flap has a section for a small name plate. The manufacturer provides a 12 year warranty against corrosion. On request, PC1 can be supplied in the form of pre-assembled units (up to seven on top of each other). This is particularly suitable for residential and multi-family houses. Each letterbox is equipped with a Ruko lock, a sophisticated security system that protects the contents of the letterbox against unauthorized access. A five-digit combination of numbers in the key profile ensures a high degree of security.