Summary

This is a Naze32 Flight Controller cover.
Most of us that fly FPV are making things small & narrow, so on the Naze we solder the pin headers under the board and pointing back into the board so to keep all our wires hidden and away.
This cover goes on the naze and bolts go through the cover, Naze PCB and into the standoffs.
You can also put a piece of foam for the BARO if you are running a FULL Naze32 Flight Controller.