Modular drawers that can be stacked on each other. Drawers have a 0.5mm tolerance and should slide with ease. The front of each drawer has a place to add a label. 

Before stacking the mounting legs may need a small amount of sanding. They should slide in and out with a small amount of pressure. Do not push too hard to make it fit or it may crack. 

The thickness of the drawer is about 2mm on the walls and base so it will be strong enough to hold metal parts such as screws and drill bits.