Z611 Mini Tower Chassis ‧Tool-Free Installation and Easy Maintenance ‧Best Performed SECC Japanese Steel Metal ‧Excellent Thermal Solution Features: • TAC 2.0 Thermal Solution: Qualified for TAC 2.0, a mass ventilation hole side panel design strengthens thermal efficiency and cools down the entire system • Cooling Fan: Optional 90mm auxiliary cooling fan at rear panel for better system cooling • Tool-Free Installation and Easy Maintenance: Tool-free front panel, drive bays and I/O slot • Configured 6 Drive Bays: 5.25" x 2, 3.5" x 3 and 2.5" x 1 drive bays for expandability of future upgrade • Side Panel Clips: The patented tool free installation side panel clips • Best Performed 0.8mm SECC Japanese Steel Metal. • 0.8 mm sheet metal construction - for better stability & durability.