"Description Features: High quality PMMA material bracket is durable and stable. Fine workmanship, compact and practical. Fits in a 3.5inch drive bay, and allows the mounting of 2/4/8/12 bays as you for wish (optional) . This product with cooling fan space reserved, cooling fans can be installed for better heat dissipation. Package with two side panels + fan fixing strip + mechanical hard disk fixing screw + fan fixing screw for DIY lover easy installation. Package Includes: 1 x HDD Storage Rack (without cooling fan and hard drive) Note: The product can be equipped with a cooling fan. Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. The error of manual measurement of the size is within the normal range of 0-2cm."