Product Detail 4U rackmount design,meets EIARS-310C standard ,3 x 5.25" drive bays, 11 x 3.5 " drive bays ,Easy drive mounting with 24 screwless rails Support EEB (12"x13"), CEB(12"x10.5"), ATX (12"x9.6"), Micro ATX (9.6" x 9.6") motherboard, Screwless top cover 2x120mm front fans, 2x80mm optional rear fans for better ventilation 2x120mm front fans, 2x80mm optional rear fans for better ventilation 2x120mm front fans, 2x80mm optional rear fans for better ventilation Switch: Power ON/OFF x 1, System reset x 1 Indicator:Power ON/OFF x 1, HDD x 1, NETWORK X 2,Connector:One front accessible USB port Power Supply Options:Standard ATX, mini redundant power supply ,Dimensions ( W x D x H ):19" x 21.6" x 7" (483mm x 550mm x 176mm) . The "RPC-450 Black 4U Rackmount Chassis" is best product for you. We recommended RPC-450 Black 4U Rackmount Chassis