The thing is solid metal. Hook is big enough to fit both my headphones and USB headset I use for work. The hook folds up when you aren't using it for headphones so it doesn't protrude from your desk. My desk doesn't have a horizontal overhang to clamp onto so using the included tool I simply rotated the clamp 90 degrees and clamped it vertically to the side wall of the desk. This thing is more than I expected especially for the price. It's clamped tight to the desk for zero movement. I highly recommend it!