I'd say its a cutoff wheel that he tryed to use as a grinding disc... Then it is what it is and you get what you got.
I use these cutoff wheels on a dayly basis, so much that the first 2 tools outta the box and on the bench are the grinder and the cutoff. Never have I seen one go like that unless.... your using it for grinding instead of cutting, well if I drop it on the floor it looks like that too.
Doug
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