Hangers, burnished iron sawtooth hinged - Pack 100
Toothed hinged hangers in burnished iron with three holes with sharp points.
The tips must be hammered against the cardboard (or other similar support) in order to anchor firmly there.
Diameter of the holes 4.5 mm
Maximum weight of the frame: about 10 kg.
In mass production, a punching machine would facilitate the task.