4U/90bay Dual redundant controller expansion enclosure by one drawer including 6x 12Gb SAS ports, 2x(PSU+FAN Module), 2x 12G to 12G SAS cables for storage or expansion enclosure with 12G interface, 4x fan module, 90x3.5"drive trays and 1xRackmount kit (2.5" drive trays need to purchase additionally)