Best performed,solid 0.8-1.0mmSECC construction. Folded Edge for safe device installation. Smart screw-less assembly/maintenance design. Reinforced stainless stell spring for EMI shield. Removable HDD @ CD-Rom cage,for easy installation and service. 90皊wiveled HDD cage,for fast installation/maintenance. Washable dust filter for easy cleaning and replacement. Dual detachable 120mm fan brackets, provide best air-flowl Mechanical lock at front bezel & side panel.