The Icy Dock MB994SP-4S Drive Bay Adapter is constructed of heavy-duty metal to hold up in the toughest of conditions. It offers a single 5.25" device bay with four slots. Each opening is designed for 2.5" drives. The hard drive bay stays cool with the help of ventilation slots on both the front and back of the device for maximum airflow. This Icy Dock Adapter has a sleek look and holds up to long use.