This is a small (10 × 10 cm) tray with dividers for temporarily storing small screws while dismantling electronic devices.
 

I made the bottom very thin so you can glue an adhesive magnetic mat (like this: https://s.click.aliexpress.com/e/_c3CNbvHd or on amazon https://amzn.to/4uC3jzb) to further prevent the screws from getting lost. I just used two small pieces I had left from another project.