I was a sucker and bought some of those awful hex wrench sets. Cobalt should be ashamed of how poorly constructed these things are. They are held together by two axles that are tightened with an Allen key. Within seconds, the screws loosen, the axles fall out and the keys fly around. You can easily put them together. But guess what you need to tighten it back up? Yes. Another set of Allen keys! It must have been a marketing genius. If you buy one of these you will need to buy another one (from the exact same set) to secure them together. And they'll fall apart if left unused in a toolbox, so be prepared to fix the kit before you can use it. Also, be prepared for it to fall apart while using it. The only benefit of these things is that they are cheap - less than $10 each. But since you have to buy two, they fall apart by the time you're sitting in the toolbox and literally the time you're using them, and for all the frustration they cause, it's better to just pay the extra money and that to get the right set (not the right one). . , which is created by cobalt!).