Very well built and hold the targets on well. I have yet to have a target fall off on anything we have at our range. They are durable so far. We have on average 20 shooters a week on our range with a range a calibers. My only real issues is the bottom of the hook is a bit thick. If you don't use JC steel you have to get your target holes cut or enlarged for them to work. That's not fun but it was a lesson learned.