I am having a slight issue with Knipex linesman pliers I am a little confused. I am new to Knipex tools and I got turned onto them by this form so I bought some and they failed on me a few weeks latter. Let me put some back story behind it, I am a Firefighter and abuse my pliers like nothing else. They need to handle way more then a mechanic or DIY user would require of them. So my first pair when I started in the fire service two years ago were made by craftsman and broke on me in the fire academy. Sears would not cover them under warranty so I bought a pair of Kobalt linesman pliers which are still kicking to this day but I wanted to try out Knipex because they were supposed to be higher end almost up there with Snap-On. So I got a pair and a few weeks into it I broke one of the jaws while trying to take the hinge pins off of a door. I called up Knipex and they sent me a new pair that I broke the jaws on a month latter. I am currently waiting on another pair of replacements but am confused as to why this is happening. My pair of Kobalt pliers have yet to fail me yet they are supposedly an inferior brand. Is something to do with the steel where they are harder and snap easier or something? 

), but just as you wouldn't judge a fish on its ability to climb a tree, you wouldn't judge a pair of pliers on how well they work as a hammer or pry bar. 