In my 45+ years of woodworking these sanding discs have proven to be the worst I've ever used. They last about 2 minutes before the grit wears away exposing the H&L base. I visited the Powertec website to learn more about their products. Their website claims they have the highest quality discs, so I called the manufacturer to give them my results; Maybe I had a defective batch and what they want to know about it. They didn't seem surprised to hear about my experiences and weren't interested in looking for codes on the packages, instead offering to send them back to me. If you go to their website you will see that these are half price items.
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