The Carta is a corten steel letterbox from Geroba, with a lockable door at the back. The letterbox has a sleek design that suits both a modern and classic home. The dimensions of the letterbox are 30 x 40 x 100 cm (LxWxH) and it weighs 25 kg.
Benefits:
- Includes two keys
- Theft resistant
- Easy to install
- Combination of strength and durability
- Weatherproof
- Made from Corten steel class A
- Corten steel is 2 mm thick
Placement
The Carta has 4 mounting holes. These holes have a diameter of 12 mm and are 20 cm apart. You attach the base plate to a concrete base. Then you place the letterbox over it and you can screw it to the top with bolts.
We have also designed our own concrete base, which we have tailor-made for this mailbox. This ensures that it fits perfectly. The concrete base can be found at the bottom of this page at smart combination.
Rust process
Corten steel is a very strong type of steel that covers itself with a protective layer of rust when exposed to the outside air. The letterbox is always delivered unrusted and gets its beautiful rust color/layer when it is outside. This process takes approximately 6 to 12 months. This process can be accelerated to 2 weeks by using the rust accelerator. The rust accelerator can be found at the bottom of this page under smart combinations.
After it is completely rusted, we always recommend applying a rust fixer. This ensures that the rust process stops and no more rust water will come off the letterbox. The rust fixer can also be found at the bottom of this page under smart combinations.
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