48U SmartRack Premium open frame rack 4 interior vertical posts with unthreaded square hole openings Standard 24" (600mm) width and 42" (1050mm) depth for optimizing floor space Ships fully assembled 3500 lbs (1588 kgs) stationary / 2250 lbs (1020.6 kgs) rolling load capacity Preinstalled casters and leveling feet Includes 50 pieces of M6 cage nuts and 50 pieces of M6 screws (equipment mounting hardware) This SmartRack® 48U Standard-Depth 4-Post Premium Open Frame Rack has no doors and no side panels. The 'EXP' version is an expansion model used when several cabinets are bayed together. Its integrated baying tabs make it easy to combine multiple enclosures in rows for data center applications. This enclosure is also compatible with hot-aisle/cold-aisle configurations.The SR48UBEXPND houses 3,500 pounds (1588 kilograms) of standard 19-inch rack equipment in 48U. Its front and rear pairs of vertical rails have square mounting holes that are adjustable in quarter-inch increments from four