No more clumsy screw installation , SunBright new Tool-Free 3.5" SATA Enclosure enables the convenience of using an external drive. Built-in patented mechanical lever , just put the SATA hdd on the sleek rack inside the enclosure and then close the lid , never easier ! Remarkable screwless and user-friendly design. With USB2.0 and eSATA transmission interface which offers 480Mbps / 3.0 GB/s throughput. The valuable scratch proof SATA connector is a patented design , it guarantees you the swapping cycle up to 50,000 times and at the same time , it protects the connector of your SATA HDD from scratches.