Very poor quality control. I made the mistake of opening the bag and trying a few smaller ones when I first received this set. Everything seemed fine so I put them in my tool box and decided they were a good buy. A few days ago I used most of the set for the first time and immediately realized the pistons were the wrong size and fell right out of the T-frame. The thumbscrew wasn't tightened, and the piston and springs behind it flew right out of the tool. And it's over 30 days. So if the seller doesn't understand my dissatisfaction with their poor quality control, it looks like I have no way of replacing the defective part. So be careful, you are paying for 6 pieces but chances are you will only get a few working tools and not a fully working set.
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