The TP1833 rack mount computer case is a great way for mounting your server on any standard rack, ensuring compatability with all types of ATX motherboards (Full-size, micro, mini) and the PS-2 ATX power supply or mini-redundant PSU. It includes 4 drive bays (1 x 5.25"" and 3 x 3.5”) and 4 full-height expansion slots. The front panel also contains 2x USB 2.0 ports, and LED lights for power & HDD, as well as power & reset buttons. It also includes 2 x 60mm fans, keeping your system cool. It can be front or back mounted, allowing for easy access to your components. It is made of durable 1mm thick cold-rolled steel, and is only 12 inches deep. The TP1822 adjustable sliding rail kit that is included in the bundle is for rackmount computers and chassis, and will accommodate rack-mountable appliances for server cabinets.The rails are built from quality materials and are capable of holding weight up to 130 pounds, and are adjustable from 26 to 40 in. Ball bearings offer smoother movement, reduce wear and tear to the rail and are quieter. The server rack rails come with universal assembly holes. The product contains the rails along with all necessary hardware needed for their easy setup.