Screw mounting
Very suitable for mounting to a concrete ceiling. Usually equipped with a flange foot so that any drilling damage to the ceiling is neatly covered.
Also an excellent tool for attaching a steel wire. Strikingly fine design.
There is also a screw mounting system, where the cable is provided with a round ball. This can move through a slot in the round head, which is attached to the wall or the sloping ceiling. As a result, the wire always hangs vertically.