U-shaped rack mount sheet metal enclosure, bent cold rolled steel with light gray powder coating, scratch and rust resistant. Consists of U-shaped main frame and perforated side panel. Front panel with two large round cutouts and multiple mounting holes for fans and meters. Perforated side plate provides efficient heat dissipation. Plenty of internal mounting holes for PCB and power modules. Rack ears for cabinet installation. Widely used for test instruments and power units. Custom sizes, cutouts and coating colors available.