Sometimes you need to add some support to small PCBs which are only mounted on header pins, if the PCB does not have mounting holes leaving it just held by the header pins exposes it to the pins straining and eventually unsoldering / disconnecting.

This model is designed to clip to both PCBs and, depending on the depth you can clip to (e.g. if there are components) you may want to trim the clip a bit, the model has small notches to allow you to easily trim it to length.