Using two of these brackets you can add a shelf to the pegboard. It works by inserting a piece of material which will span between the two of these brackets.
The bracket is 20cm tall and 16cm deep(including the pegs) and 1cm wide.
The opening for a piece of material is 3.4cm by 14.2cm.
On the render shown the piece of wood is 34cm.
The author hasn't provided the model origin yet.