RM4U1918SBK is a 4-unit rack-mounted instrument enclosure designed for both rack and desktop applications. The enclosure features a robust all-aluminum construction with a textured black powder coat finish, measuring 7.00 inches in height, 16.60 inches in width, and 18.00 inches in depth. It includes mounting flanges for 19-inch rack installation, interchangeable front and rear panels, self-adhesive rubber feet, and complete assembly hardware. The knockdown design ships unassembled for convenient handling and shipping protection, and it accepts an adjustable rear bracket (RM4U18BRKT) for enhanced stability in deeper installations. This enclosure is ideal for housing electronic instruments, control systems, and laboratory equipment in professional rack environments.