MAIN OVERVIEW FEATURES: Motherboard Supported: Micro ATX,ATX,SSI CEBNumber of Fans Supported: 3Number of Fans Installed: 1Number of External 5.25" Bays: 4Number of External 3.5" Bays: 2Number of Internal 3.5" Bays: 4Number of Total Expansion Bays: 10Number of Total Expansion Slots: 7Total Number of USB Ports: 2Number of Power Supplies Supported: 1Material: SteelCompatible Rack Unit: 4UForm Factor: Rack-mountableHeight: 6.9"Width: 16.9"Depth: 17.5"Package Contents: RM42300 Rackmount Enclosure1 x Add-on Card Retainer