StarTech.com 4 Bay Aluminum Trayless Hot Swap Mobile Rack Backplane for 3.5in SAS II/SATA III - 6 Gbps HDD - Connect and hot swap four 3.5in SATA III or SAS II hard drives to your computer system in three 5.25in bays, with support for SATA 6 Gbps

Built-in fan Support for SATA revision I/II/III (1.5/3.0/6.0 Gbps) Power and Activity LEDs for each drive Support for SAS revision I/II (3.0/6.0 Gbps) 4 drive bay design Solid aluminum construction Key lock design Trayless design for easier hot swapping Installs in three 5.25in drive bays UL94 - V0 flammability rating