ICY DOCK FatCage MB153SP-B 3 x 3.5 Inch HDD in 2 x 5.25 Inch Bay Hot Swap SATA 6Gbps HDD Rack/ Cage/ Module 3 in 2 RAID backplane module. Fits three 3.5 SATA I / II / III (SATA 6Gbps) hard drives in two external 5.25 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.