Mount a 3.5in hard drive to any desktop with an available 5.25in bayThis Drive Bay Mounting Bracket…

The StarTech.com HSB220SAT25B offers an innovative solution for easily swapping two 2.5" SATA hard drives or SSDs in a standard 3.5" bay. With its trayless design, drives can be quickly inserted and removed without tools. Supports SATA III up to 6 Gbps for maximum performance.
This 3.5" SATA hot-swap bay allows you to install two 2.5" SATA hard drives (HDD) or solid state drives (SSD) in an available 3.5" bay. Featuring a convenient 'no mounting required/easy eject' feature like a tape cartridge or floppy disk, the backplane doesn't require drives to be installed in a tray - making it ideal for quick and easy drive removals and insertions during system building or integration into rackmount systems or industrial environments. SATA III support provides transfer speeds up to 6 Gbps for full SATA III performance. Fully compatible with RAID installations for enhanced storage applications. Includes activity and power LED indicators, RoHS certified, and comes with SATA cables and mounting screws.