Cooler Master 4 in 3 HDD Module Device - (STB-3T4-E3-GP) One 120x120x25 mm Blue LED fan, 1200 rpm, 22 dBA Convert the three 5.25" drive bays into a four 3.5" HDD module with 12cm sleeve bearing cooling fan Compatible with ATX case with three 5.25" drive bays Ideal for CM Stacker series and other cases Aluminum construction with ABS bezel