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Title: Works for less than 5 min then dulls.
Review: Went through two of these bits. At first they do cut through the grout like a hot knife in butter, but after not even 5 minutes these things just stop cutting and simply stay in place and start to glow red hot if you try to move it. Way to costly to constantly be replacing these bits. Going to give the diamond wheel points a try instead (7134 and 7144) since they seem to be a bit stronger and cost less.
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