It's a faceplate for my BulkyMIDI-32 Module, it is mounted on the front of the unit - giving you a nice finish to the device. It is mounted on the panel module using screws and M3 nylon hex standoffs. Note that this version of the front panel (FP) was designed to fit a 1.3" OLED display, it also extends below the main module so that it also serves as a front panel for the extras-board. If you do not plan on building the extras-board, you may instead prefer the shorter Faceplate FP2 as an alternative.

As this is just a faceplate, check out the related shared projects for an overview of all things BulkyMIDI-32 (including adapters and other modules). In order to complete the BulkyMIDI-32 device itself, you may check out remaining modules for those needed to build one up (includes variations).