StarTech.com Professional 5.25-Inch Aluminum ATA Hard Drive Mobile Rack with 2x 40mm Fan DRW115ATABK (Black) Guaranteed compatibility with PC and Mac systems Drive enclosure designed with a handle release mechanism for ease of use Heavy duty all-aluminum construction provides extra durability and heat dissipation Two front-mounted ball bearing fans to provide additional hard drive cooling 7K Insertion Rating equates to nearly 4 removal/insertion cycles per day, every day for 5 years Can be mounted from the side or the bottom Two ball-bearing fans maintain optimum cooling and increased air flow Caddy is built with a key lock mechanism to prevent the hard drive form being accidentally removed while in operation