10x10=100 nozzles holder columns are marked with engraved text .1 .2 .3 .4 .4 .4 .5 .6 .8 1.0 so you know the nozzle size by its position (three columns are dedicated for the most common .4, but of course you can ignore the engraved text). Different material nozzle are well visible from the top so you can store them as you wish.
The holes in the board are a good fit to screw the nozzles and keep them firm in position (there is also a final hexagonal shape over the hole surface that grab the nozzle). The distance between nozzle is right for a screw driver hex holder (wrench) to fix the nozzles to the board. If you swap the nozzle because you want to change the printing diameter and want to reuse the nozzle previously used, the first rows are dedicated to the less reliable nozzles toward the new once (written(engraved) beside).
Store a generous amount of nozzles (printing corrosive filament as carbon fiber makes nozzles less reliable, so is a convenient option to have many brass nozzles) different diameters are immediately recognizable by the position.
I give you an idea, mount a microscope in the printing head and seek the best nozzle by watching the holes facing upward. They are at a distance (8.8141, 9.4782) to allow up to 10.3mm external diameter wrench