The SR42UB1032 houses 3000 lb of standard 19-inch rack equipment in 42U. Its front and rear pairs of vertical rails have threaded 10-32 mounting holes that are adjustable in quarter-inch increments from 4 to 37 inches. Adjustment is quick and an easy-view depth index ensures consistent rail placement without requiring time-consuming measurements. Each rack space within the enclosure is numbered for ready reference.