With these clips you can fasten an electrical installion cable on a rack rail.
It fits on the most rails you can get in Germany in a DIY Market. The notch is 3,5 mm wide and should be at least 16 mm long for it. It is made for a NYM-J 3x1,5 mm2 cable. Every other cable wit a diameter of 9 mm will also fit perfektly.
You can print the single or the double version.
The author hasn't provided the model origin yet.