These heavy-duty industrial grade plastic enclosures include molded mounting brackets for easy installation and have a lockable hasp to prevent unauthorized access to the controls. These plastic enclosures are non-corroding, and are great for applications in high moisture or dusty locations. Ends rusting problems forever NEMA 3R rated Made of heavy-duty industrial grade plastic Rainproof all-plastic enclosure is perfect for applications where high humidity and/or dust can be a problem Plastic enclosure has combination 0.5 and 0.75 in. nominal knockouts, one on back and each side of enclosure, and two on bottom