These are very good spring clamps. They have worked well for my application and are holding up very well. I considered returning them as the sizes didn't fit the size I really needed most, but since they worked so well I decided to keep them and order some larger ones to complete my project. Not sure about some of the negative reviews. I know it can be a bit difficult to open and keep them open so maybe some have broken some reviews. I went ahead and bought some clamp pliers to make installing the clamp easier, $9 couldn't be better and they worked fine. The right tool for the job can save a lot of frustration.