The silver 5.25" to 1 x 3.5" Trayless SATA/SAS Hot-Swap Cage from iStarUSA is the third generation tray-less hot-swap hard drive cage. It supports the current transfer rate technology of 6.0 Gb/s (SATA I/II/III and SAS I/II), and is compatible with 3.5" hard drives. Heat dissipation is enhanced by aluminum construction and an optional 1.57"(40 mm) fan. A SATA power connector increases compatibility with most power supplies. The metal key locks help secure your hard drives and prevent unauthorized access.