They break when folded into the grinder. Useless for this purpose. Also, they are cheap and crumble/disintegrate very quickly. I've used a lot of sandpaper and this may be the worst product I've ever bought. Also, the packaging was damaged (the bottom of the sandpaper cardboard/paper cover was completely missing as if it had been previously opened and returned). Shipping box was ok. It was the actual packaging that the sandpaper came in. Maybe it's just old and deteriorating over time. In any case, it is not recommended.
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