Rugged heavy duty full metal construction with suggested applications in Imaging, Medical, and Military systems, Media servers, and IPCs, approved & used by Tier 1 companies. ^^ Fits 1 x 5mm to 15mm 2.5 SAS/SATA HDD or SSD in external 3.5 drive bay. ^^ Anti-Vibration Technology - creates a safe environment for hard drives or SSDs. ^^ Active Power Technology (APT) - individual led only powers up if there is drive installed in the drive bay. ^^ Anti-Dust Flap prevents dust from entering when device not used.