<http://schema.org/description>
"Six millimetres: A letterbox can be this flat. The housing disappears into the wall, leaving only the plane front panel visible with its solid grip rail. From the inscription through to access control: Combinable with every conceivable function."^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.architonic.com/es/product/siedle-siedle-steel-flush-mounted-letterbox/1124674>