The 35-IS-BAY-B is a short depth 3.5" drive bay and removable carrier/tray for 2.5" SATA/SAS 6.0 Gb/s drives. This is a hot-swap cage built with durability in mind using aluminum and steel construction. Thumb screws keep the carrier in place, and an LED light features blue light to show hard drive power and red light for HDD accessing.