Door stop metal
Door stoppers or holders: functions, types, installation : Door Stop Metal
Quote from Article entitled Door stoppers or holders: functions, types, installation:
A magnetic door stopper appears to be a clamp for a door with a magnet. A metal plate, which is attracted to the stopper and provides the open position of the door, is attached to the bottom of the door leaf. Simple stoppers limit the opening angle of the door softly, because of the using of the rubber compactor. Mechanical stoppers keep the door open with the help of a special fixing mechanism.
The full version of the article can be found here.