1915-3-301-21 Size: 21U Features: -Includes 24 rack screws and cage nuts. -Finish: Black powder coated. -Universal cage nut style rails. -Bolt-together design. -Made in the USA. Product Type: -Cabinet system. Mounting Type: -Cage nut. Frame Type: -Open. Finish: -Black. Thermal Management: -Passive. Stand-Alone: -Yes. Weight Capacity: -300 Pounds. Application: -IT/Data centers/Pro A/V. Commercial Use: -Yes. Country of Manufacture: -United States. Size 12U - Size (Unit): -9U-20U. Size 16U - Size (Unit): -9U-20U. Size 21U - Size (Unit): -21U-30U. Dimensions: Size 12U - Overall Width - Side to Side: -21.5". Size 12U - Overall Depth - Front to Back: -18". Size 12U - Overall Height - Top to Bottom: -24.13". Size 16U - Overall Height - Top to Bottom: -31.13". Size 21U - Overall Height - Top to Bottom: -39.88".