This is a two part case of an Inkbird temperature controller. It's compatible with the ITC-2000 and the ITC-1000, although the former only controls one relay. You can use the second hole to wire up a straight outlet that's not controlled by the thermostat if you have an ITC-2000.

Measurements are for:

• this input power socket and switch and
• these output power sockets

You also need four wood screws or self-tapping sheet metal screws (about 40mm and 3mm diameter) - I used #4 wood screws 1.5 inches long.