The DEXP AT-DH07 mounting bracket is an accessory designed for installation inside a PC. Its key feature is that it serves as an adapter between a hard drive of one form factor and a PC supporting drives of another form factor. In this case, 2.5" hard drives are installed into a 3.5" bay using the bracket.
The metal construction of the DEXP AT-DH07 contributes to the durability of the accessory. This helps prevent deformation of the hard drive inside the PC, saving user costs. Correct operation is achieved when the bracket is securely fastened with screws inside the PC case.