Data security is essential for any business. For military and medical settings, both software and hardware security is necessary to protect sensitive data. The ToughArmor MB994SK-1B is the first ToughArmor cage that features individual steel locking mechanism for each bay. You'll put your mind at ease. knowing that your data has extra layer of the protection, and safe inside an strong full metal enclosure. The ICY DOCK ToughArmor MB994SK-1B takes 4 x 2.5" SAS/SATA HDD/SSD from 7mm to 15mm height, and supports Hot Swap for quick and easy drive replacements. The unit is constructed of robust metal to survive the most demanding conditions, dual 40mm cooling fan with ventilate slots on the front/rear help to cool your drives 24/7. The MB994SK-1B is commercially designed for Medical & Military systems, IPC, enterprise, and industrial settings.