Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter The Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter lets you connect Thunderbolt and Thunderbolt 2 devices - external hard drives and Thunderbolt displays, for example — to any of the Thunderbolt 3 (USB-C) ports on your MacBook Pro. As a bidirectional adapter, it can also connect new Thunderbolt 3 devices to a Mac with a Thunderbolt or Thunderbolt 2 port. Depth: 67 MM Lets you connect Thunderbolt and Thunderbolt 2 devices to any of the Thunderbolt 3 (USB-C) ports on your MacBook Pro It can also connect new Thunderbolt 3 devices to a Mac with a Thunderbolt or Thunderbolt 2 port Height: 198 MM Width: 18 MM This adapter does not support DisplayPort displays like the Apple LED Cinema Display or third-party DisplayPort and Mini DisplayPort displays.