USB 3.0 Coupler: Shielded industrial panel mount is a female/female coupler, compatible with USB 3.0/2.0, providing a more stable transmission environment for data in electronic information environments. Easy installation: Standard D series connectors are used for panel installation, saving installation space, USB socket to socket coupler can be installed on site, no soldering, no installation tools, just plug directly into the standard USB head for quick installation. High Speed: The transmission speed is up to 5.0 Gbps, plug and play, enjoy high-speed data transmission with this USB installation plug. Connect devices with USB ports such as PCs, , desktops, laptops, laptops, media players, external USB hard drives, AV receivers, or other devices with USB ports through the wall plate to a hidden wall cables behind. quality: zinc alloy material, scratch-, flame-retardant, anti-ultraviolet, anti-aging. Colour: Black Material: zinc alloy Package Contents: 4 x USB 3.0 coupler 8 x screw(screw color is random, Do not accept designation) 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.