This 4 Bay 2.5 inch to 3.5 inch SSD Hard Drive Adapter Bracket is made of aluminum alloy and allows for the installation of 4 x 2.5-inch notebook hard disks or SSD solid state hard disks. It is designed to be installed in a 3.5-inch hard disk slot inside a desktop case, providing a convenient storage solution for PC users. The bracket comes with 20 screws and 1 aluminum frame, and its dimensions are 75x66x13mm/2.95x2.6x0.51in, weighing 143g.