Tool-Free Installation and Easy MaintenanceCp>Tool-free front panel, drive bays and I / O slots.p>Configured 6 Drive BaysCp>5.25 x 2, 3.5 x 3 and 2.5 x 1 drive bays for expandability of future upgrade.p>Side Panel ClipsCp>The patented tool free installation side panel clips.p>Folded EdgeCp>No sharp edges or debris for safe installationp>Stamped Motherboard SupportCp>Easy MB installation. No MB standoff required.p>Tool-FreeCp> Screwless Front Panel Screwless Side Panels Screwless 5.25 Drive Bays Screwless 3.5 Drive Bays Screwless PCI-E Expansion Slots p>3.5 / 2.5 Drive BaysCp> 3.5 Drive Bays x 3 Internal 2.5 x 1 p>Excellent Thermal SolutionCp> Intel Certified TAC 2.0 Qualified for TAC 2.0,a mass ventilation hole side panel design that strengthens thermal efficiency and cools down the entire system. 80mm or 90mm Rear Fan (Optional) p>Front PortsCp> USB 2.0 x 2 HD Audio Optional USB 3.0 x 2 p>OptionalCp>' CeSATA Chassis Intrusion Switch 3.5 to 2.5 HDD / SSD Bracket Supports 2.5x 2 Optional 60 mm Fan x 1 (60 x 60 x 10 mm, 2500rpm, 20dB Fan, 4 Pin Power Connector) p>