There was an original type of installation needed that started the security device’s development.
Because the creator of this device lived in a part of the world where wood stud construction is the most common type used for dwellings, most of the devices found for securing items were not a good choice…they were usually for concrete, and if installed into wood they failed the “difficult/impossible to remove test”, or were specialized systems that were expensive to obtain and install.
Having been a building contractor for 40 years, he was very familiar with structural elements that could resist earthquakes, and can assure you that the removal efforts of a criminal of this sort of fastener would be puny compared to the strength of an earthquake!
One of the fasteners recently developed for wood will drill its own way into a stud without a pilot hole by just screwing it in.
This became part of the design, but it had one problem…it was just as simple to remove using the reverse of the installation process.
Thus, the security device has a second part made from heavy steel just like the piece bolted to the stud, and it covers the bolts so they are inaccessible.
As soon as you slip a selected cable or padlock through the hole, the part that covers the bolts cannot be removed without removing the cable.
Once that was figured out, it became simple to make it workable for other types of structural situations, by modifying only the fasteners used.