2.5-inch/3.5-inch hard disk metal bracket, which can install 3x 3.5-inch hard disks or 4x 2.5-inch hard disks. Universal: compatible with SATA/IDE interface hard disks, supporting 2.5/3.5-inch SAS/SATA interface mechanical hard disks and solid-state hard disks. Metal steel plate + hollow design, the metal steel plate has fast heat dissipation, increases the contact area between the hard disk and the air, and quickly dissipates the heat of the hard disk. Equipped with fixing screws to avoid shaking and loss of important data after installation in the chassis. Shockproof and drop-resistant, avoid hard disk damage, protect the hard disk from damage, and extend the service life of the hard disk. Color:Black Material:Metal Package Contents: 4 x hard disk expansion brackets 2 set x screws