This clever design is cold forged and CNC machined from 6061-T6 aluminum alloy to create a durable and dependable clamp. - Special Features: Dropper Hose Guide. - Material: Aluminum.
The hook is plastic. So if you undo it to put around the hose (if your post is already installed) be very careful doing it back up as the slightest pressure will snap the plastic, making it useless. I was careful and it broke anyway.