Rosewill 4U Server Chassis/Server Case/Rackmount Case, Metal Rack Mount Computer Case with 8 Bays & 4 Fans Pre-Installed (RSV-R4000) Superb Scalability : With three 5.25-inch external bays (which can switch to a 3.5-inch HDD x 4 module), eight 3.5-inch internal drive bays, and seven expansion slots, you can expand your server computer easily. Excellent Cooling Design with 4 included case fan : The rackmount server chassis is engineered with optimal cooling in mind. Two 120mm front fans and two 80mm rear fans are included in the chassis to keep your whole system well ventilated Extra Clever Designs : The RSV-R4000 features dual USB 2.0 connectors on the front panel for easy connectivity. Motherboard Compatibility: The Rack-mount server chassis is compatible with Motherboard: CEB (12" x 10.5") and ATX (12" x 9.6") and below Front Panel Lock: Stylish Black with front panel lock provides a better security for your rackmount server case Solid and Steady Structure : A solid 4U rack mount industrial server case combines huge rooms, security, and expansion all together HDD Screwless Design : Users can easily take off the hard drives with the screwless cage and modular release buttons. Tremendous capacity : With huge space (7.00" x 23.00" x 16.80" including panel ), RSV-R4000 commits with vast room to meet your demand for an outstanding system Motherboard Compatibility: CEB (12" x 10.5") and ATX (12" x 9.6") Dimension (H x W x D: inch/cm) : 23" x 16.8" x 7" (635 x 427 x 178mm (Include panel)) Front door with key lock for better security