
I bought these to sand aluminum. Nothing hardened and they were polarized after one try. I mean, the whole long square lace was soft all around. Out of curiosity, I tried them on soft pine wood. "Pointed" barely lasted until the simple word "TEST" was engraved at the end, 1/4" deep and 2" high. I would never touch these pieces again! They do NOT meet the stated standards. I've had more success with ceramic Dremel bits, which I have no idea what they're for, they just come standard with every Dremel.

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