The mini size enclosure case is not a waterproof box, but a dust proof box. It is suitable for indoor use. Widely used for the small electronic DIY project components boxes, such as the power and USB module, the switches, the terminals, and so on. External Size: 80x50x26mm; Internal Size: 75x46x20mm; Color: Black; In the package of: 4 x Enclosure Case. It is made of ABS plastic, with good electrical insulation and flame retardant, durable for use. Good for applying in electric controlling, transmission, and other maintenance, repair, and operation applications. Steps of installation: 1. Assemble the module or the components in the box; 2. Drilling the proper hole if it is necessary; 3. Snap the cover to seal the box. This electric plastic box without any reserved installed wiring hole, please drill holes as needed.