As these bins stack taller, I needed a way to secure the top so pulling on the drawers doesn't move the entire assembly. Provides a screw hole for mounting. All of my boxes are the MiddleMiddle variety as I don't care for a smooth look on the outside. The exposed connectors actually make great mount points for other things.

Two versions available. Normal uses the 5.3mm connector and Tolerant uses the 5.0mm "tolerant" connector as the basis.

Thanks to termlimit for making such a versatile system.