Enhanced Cooling System: Equipped with a dedicated fan for superior heat dissipation, ensuring your hard drives operate at optimal temperatures. Durable Construction: Made from robust metal, this bracket securely holds up to four 3.5-inch hard disks, providing a stable and reliable foundation for your storage needs. Space-Efficient Design: Stackable feature allows for significant expansion in your PC case, making it ideal for gamers, video editors, and professionals with extensive storage requirements. Easy Installation: Simple setup process that fits seamlessly into most PC cases, enhancing your system's functionality without hassle. Note: Due to different batches, there may be differences in product appearance and printed text, which will not affect use. Color: A: Black / B: White Material: Metal Package Contents: 1 x 4x3.5 HDD Bracket Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.