These are simple holder's created for the BOLT board, which is based on ESP8266 with custom firmware.
For more info on the project check out - https://www.boltiot.com/
To buy a BOLT check out - https://www.indiegogo.com/projects/fully-integrated-iot-platform-made-for-ml-arduino

And for all kinds of projects check out the projects on Hackster.io - https://www.hackster.io/bolt/products/bolt-wifi-module

Screws to use with 3D printed part - 2x56

FlashForge

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