Recessed box made of special steel (Magnelis) for mounting of VD 500 in the floor or other hard surfaces. It is designed for mounting and cast into the floor of the museums, vaults, safe deposits and gold deposits and to cope with the pressure of a golden chariots at 5 tons. The box has threaded holes for VD 500. This box is attached with supplied expansion bolts that provides a large detection range but also to level the box during installation. There are also ready-made “Knockout holes” for a conduit pipe which makes installation easier. The box is equipped with an opening contact in order to provide extra security.