For games that require you to throw many dice, this tray gives you a slight angle to retain 20 16mm or 30 12mm dice above a lower larger tray for tossing them into. Once you toss your dice, you can slide them back up the angled tray into the holder and they'll slide back into a 4 X 5, or 5 X 6 position depending on dice size. This makes it very easy to count off how many dice you are picking up for each toss.
The author hasn't provided the model origin yet.