Compact Size Version MB123SK-1 Series 3.5" SATA Internal Enclosure is the perfect solution for your storage needs because it is not only offers greater flexibility by being removable and security, but by also having an access key lock. The MB123SK-1 also offers stability to your systems by keeping your hard drives cool through an all aluminum body and a cooling fan. The removable tray system allows for a convenient solution for multi-drive exchangeability and maintenance. It is made in a compact size now for limited depth system integration.