DFRobot Relay V3.1 Box

I really like the DFRobot Relay Module V3.1 because it's compatible with both the Arduino and the Raspberry Pi. This box will hold one of these bare relays, making it safe and durable. There is text on the lid for the name of the relay and an indication of which connection is ground, voltage, and signal.

Relay: https://www.dfrobot.com/product-64.html

The box is designed to use 4 of these screws: https://www.mcmaster.com/#92295a106