These are Sparkfun's large, beefy aluminum enclosures, which have been built tough enough to withstand a truck. This 2mm-thick, die-cast enclosure is rated IP54 against dust and splashing water. Because it’s aluminum, it’s easy to cut and drill so that you can add LCD screens, buttons and cable connections. If you want to “pretty up” your project, hit this with some fine-grit sand paper and buff it or just spray paint it!
The lid mates nicely to the top of the enclosure and is secured with 9mm long M4 screws (included). This aluminum enclosure version features a smoother metal finish as well as a more structurally sound design.