One of the suggestions was as a mounting point for metal or wooden poles. This suggested, to me at least use as a joint for scaffolding. The holes of differing sizes accommodating pole diameters suited to each purpose for a given scaffold.

On the outside the protrusions could have been used for tying ropes that secure the joint to the pole. Could have been very strong if also threaded inside the dodecahedrons as well. All reusable and modular. Alright, may be a total fantasy though.

The thing that nullifies this as an idea for me is it would be expected therefore to find absolutely thousands of them. I don't know enough about it, but I got the impression it's much less than that, and it'd seem brass would last better.