ICY DOCK FlexCage MB973SP-1B Tray-less 3x3.5" HDD in 2x5.25" Bay SAS / SATA Hot Swap Rack / Cage / Module Fits 3 x 3.5" SATA HDD into 2 x 5.25" Device Bays. Supports SATA 3 (6 Gb/s) hard drives. Commercially designed for tower workstations and rackmount servers. 80mm cooling fan for maximum air flow. Tray-less design for tool-less drive installation. Ideal for genuine plug & play and hot swap use.