These storage trays are for round threading dies which are used to cut threads on bar, bolts, etc. The trays stack on top of each other and are intended for storage use in your toolbox.

The archive includes STL's for the common die diameters of 1 1/2", 1" and 13/16" (38mm, 25mm & 20mm). All the trays are the same size so you can stack any tray onto the other.

I have included the STLs as well as the Freecad files (0.18.4) so you can completely customize them as you wish.