My helper has an artificial lens and lost most of his vision in an eye due to a disintegrating disc (on an air powered grinder), I have had disc chunks go through Carharts/gloves etc. It is super dangerous, I only use electric now and try to never use thin cutting discs, I have not seen any difference in brands except that the Forney's seem to not disintegrate into chunks( but they wear out really fast).Full face mask is recommended.
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