Holds a lot! Tiny but deep.
I am so pleased with how many options there are for these trays, and clearly described on the site. I am able to store all my brads in one 30 compartment tray, and grommets in another. I recommend covers for these if you plan to take the tray out of the drawer. It's a tight fit, and if the tray is knocked or bent, or the drawer comes all the way out by accident, then you may have pieces everywhere. The other option is to plan on removing the whole drawer and use that on your work surface, which works fine too. The very small compartment fits 2-3 fingers to pick out a few items. Otherwise, use a tool or small spoon to remove items. I wish it were clear or white. It's hard to distinguish colors with back and shadows.