These are modular drawer organizers for your desk. The drawers have dovetail slots, making it possible to stack as many as you want. There are several different types of drawers, including drawers without separators, drawers with 2, 3, or 6 compartments, and even 2-level drawers for things like resistors, diodes, etc. All drawers have the same external dimensions (90 x 50 x 25mm), so they will all fit perfectly into the drawer body.
The drawers are ideal for storing small SMD components as they are designed with 3 levels and 48 sections in each level. Enjoy your organized and tidy workplace!