The TetherBlock QR Plus Arca grey prevents accidental removal of a cable from your camera's data ports, causing inconvenience or even damage to the port. A USB, FireWire, or HDMI cable is fed through one of TetherBlock’s three channels, and is held securely when the plate is attached to the camera base by a slotted screw, which can be tightened with a screwdriver or coin. You can shoot shoot handheld or attach the TetherBlock directly to an Arca-Swiss pattern quick release. There are ¼” and 3/8” sockets on the base. Manufactured in the USA from a single piece of precision milled T5 aerospace aluminum alloy, the TetherBlock is extremely durable and lightweight and is covered by Tether Tools Lifetime Warranty.