From the designer:
This is a custom insert that I have designed to fit your Milwaukee Packout to store your M12 23 Gauge Pin Nailer and accompanying kit. It specifically fits the Milwaukee 2 & 3 Drawer units (48-22-8443 & 48-22-8442).
This is the ultimate modular storage solution for your Packout Drawers! Files are provided for having your insert on either the left or right side. I will have many more designs to share for the drawers soon so you can mix and match your inserts to set up your own perfect drawer units!
The specific M12 Pin Nailer that this is designed for is model 2540-20, link is provide here: https://www.milwaukeetool.com/products/2540-20
This insert can be ordered in the color of your choice, and it can be ordered to fit on the left or right half of a drawer.