ICY DOCK FatCage MB154SP-B 4 x 3.5 Inch HDD in 3 x 5.25 Inch Bay Hot Swap SATA 6Gbps HDD Rack/ Cage/ Module 4 in 3 RAID backplane module. Fits four 3.5" SATA I / II / III (SATA 6Gbps) hard drives in three 5.25" device bay & fully supports SATA Hot-Swap function. 80mm cooling fan with full metal body for excellent heat dissipation for the most intense applications. Compact and space saving to fit multiple drives.