Simple Configuration and High Rolling-Load Capacity for Clean Equipment InstallationThe SR42UBEIS is compatible with all standard 19-inch rack equipment. The SR42UBEIS uses front and rear pairs of vertical rails with square mounting holes. The rails are adjustable in quarter-inch increments to accommodate equipment depths from 4 to 37 inches. Adjustment is quick and convenient—simply unscrew the rails, slide them to the desired depth and restore the screws. An easy-view depth index ensures consistent rail placement without requiring time-consuming measurements. The enclosure's heavy-duty steel construction and large-diameter industrial casters can support a maximum 3,000 lbs rolling load so that all of the equipment can first be installed and configured in a clean environment.