These are hooks for IKEA Vittsjö shelfs. (for example: https://www.ikea.com/de/de/p/vittsjoe-regal-schwarzbraun-glas-50214678/ )

There is a small one, and a bigger one. The bigger one consists of two parts.

(Ignore the 2 color print in the pictures, i was using some PLA leftovers)

Print Option:

PLA

25% Infill

If you have any questions, feel free to ask.