Athena Power MR-135BLC Mobile Rack. This is a 5.25 inch rack with key lock. Features 40mm fan and Power on/off. The MR-135BLC mobile HDD rack consists of a frame and a slide-out HDD tray. The frame is designed to be installed in a 5.25" drive bay, and the HDD tray can accommodate a 3.5" drive and easily slide in and out of the frame. The MR-135BLC offers a great solution for users who move drives between home and office frequently, or who have to secure their drives in drawers or safes every day when out of the office. A lock on the front panel serves two purposes – as a power on/off switch and as a mechanical lock for security. Plus, the HDD rack is made of aluminum, offering rugged strength and enhanced dissipation to protect your drive, and your data.