It specifically fits the Milwaukee 2 & 3 Drawer units (48-22-8443 & 48-22-8442). The specific tool that this is designed for is model M12FDDX, links are provided here:https://www.milwaukeetool.com.au/power-tools/drills/drill-drivers/M12FDDXKIT202B.htmlThis is the ultimate modular storage solution for your Packout Drawers!Variations are available for having your insert on either the left or right side.This way you can mix and match all the drawer designs to set up your own perfect drawer units! Features - Super Flexible Design: Super Compact Storage - Designed to allow the swappable heads under M12 Tool itself! This provides an incredibly efficient design. Modular Tubs - Options available for 21 Custom Modular tubs! Pick the options that best suit your needs (Full details covered in the following section). Two Complete File Sets - Files provided for having your insert printed to suit the left or right half of your drawers. Belt Hook Support - You can store your tool in either the "left" or "right" inserts and it will still fit regardless of which side the belt hook is on. M12 Battery Storage - The insert allows for the tool to be stored with the 2.0ah inserted. The storage tub area then easily fits any M12 Battery size (including the 5.0ah and 6.0ah M12 batteries).