Robust electronic instrument enclosure made of aluminum die-cast alloy (tough yet easy to machine). The overlapping design provides protection against dust and splashes, as well as improved EMI/RFI shielding. Includes screws that are screwed into factory-threaded holes. The type and number of screws may vary. The standard versions comply with protection class IP54. The waterproof versions comply with protection class IP65 and include a gasket. The gasket is supplied loose in the enclosure (not pre-installed).