This box is exactly as advertised. I used it to house a 12v battery, terminal block, fan, timer, solar controller and some toggle switches. I have a homemade solar pool water heater that works outside with a storage tank and extra lighting for my patio. It holds water so far and is a very good product. A rear mounting plate, mounting hardware, steel latches and a clear outer cover make this a breeze. Its internal and external dimensions are fully consistent with those indicated. I can't say anything about the durability yet, but as it stands, I would absolutely recommend it.