IN-WIN No Power Supply 3U Rack mount Server Chassis IW-R300-00-00 (CASE ONLY) Case Type: 3U Rack mount Material: 1.2mm SGCC M/B Type: ATX (12.0 x 9.6 inch), CEB (12.0 x 10.5 inch) Drive Bays: 9 (External: 2x 5.25", 1x 3.5",Internal: 5x 3.5", 1x Slim CD-ROM) Expansion Slots: 7