Desk Grommet USB Hub: Designed for easy access to the ports of a PC on your desktop. You can mount the USB hub on the grommet hole, to make full use of space for desks. And it features 4 USB 3.0 ports, which can be used for data transmission. Connect your flash drive, hard drive, etc. 4 Port USB 3.0 Hub: Instantly expand 4 USB 3.0 ports to your desktop PC, convenient for connecting a flash drive, mobile hard drive, Bluetooth adapter, mouse and etc. syncing data at blazing speeds up to 5Gbps in no time.