I bought this to try on an existing pinch grip that didn't fit at all. The next day I ordered a suitable instrument for his use. I inserted the first (non-stainless) steel fastener into the 20 gauge sheet metal by slowly but deliberately pulling on the pinch handles and suddenly released them with the feel and sound of a fastener loosening. I tried a second fastener from a different batch (some came with the tool and I ordered it extra) and got the same result. I switched to the tool that came with the new handle and it worked like a champ. I looked at this insert and saw just a little bit of shiny metal where the threads come off. I also noticed that the threads are very fine, which becomes clear when compared to the new tool. In fact, I was able to use fasteners that this set couldn't easily compress with the new tool.
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