Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Terrible

I decided to use the carbide grinding stone to help remove spurs from wood i was working on. The actual carbide grinding stone separated from the metal piece 3 times no matter how deep i had the bit set into the dremel. The company dremel was great about sending replacements at no cost however i was not expecting to have such an issue with the piece separating. Maybe they should make the whole piece out of the carbide or i should stick with using it for only etching glass etc.