Very poor quality. Don't waste your money.
Like that you can adjust the clamps so they don't get too tight, the choker is really difficult to do on your own. It doesn't get very tight (or maybe I just have a tiny neck, idk), but I guess that may be a good thing, if you don't have someone with you, you wouldn't want it too tight and pass out. It's still pretty cool and I like it and it looks cool on to show off. :)
get what you pay for. cheap cheap clamps. modifying