
When I received them I immediately opened them up and checked that they were working properly. In this case they did. I had an unopened one that I opened recently and it didn't work either. The product works great for me as I use it thousands of times in my shop. Because of the price, I don't expect them to last forever, but they can break or stop working in a week or half a year. I bought a 1/8" metal punch and it has worked flawlessly for years. I want it to be like this for 1/16" and 5/16"; This is just a temporary situation for me as I intend to to replace the seal bar in my heat seal unit which has a $600 hole punch built in. They don't make 5/16 "just 3/8" which is way too big for my product so I moved it.

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