Shelf carrier for scaffolding pipes (diameter: 42.4 mm ).

This is a shelf carrier to be mounted on a scaffolding pipe with a diameter of 42.4 mm.
There is a 0.1 mm margin to allow for uneven surface finishing.
It's purpose is to carry a 19 mm thick shelf which is part of a workbench.
Here there is a 0.5 mm margin for slightly thicker shelves or local anomalies in the surface.