I used this to house the 12v timer I use to control my Livewell aerator. I originally used a slightly smaller Hammond box, but the board didn't quite fit due to the internal screw posts. The timer fits nicely in these, with room for wires on either end of the board. GERI New Version Multifunction Relay Cycle Timer Module 12V - Programmable with individual settings (Increased to 18 modes)