The Kingwin KF-91-BK Serial ATA HDD Mobile Rack is just what you need to expand your computer filled with data! This mobile rack fits most standard cases with a 5.25" drive bay and houses a single 3.5" SATA hard drive. A 40mm fan sits at the rear of the rack to ensure your drive stays cool. To make sure your data is secure, the mobile rack also has a key lock.