I had high hopes for this bit but unfortunately after only a few holes using the supplied bit became problematic. The drill is too long for my use and therefore comes loose when drilling. This caused the tips of the countersinks to break off. I checked the screws for tightness before use (I had to adjust the depth) so this wasn't user error. I'll say it gets three stars because it's very sharp and cuts very well. I replaced the bit with another bit from a worn countersink and was very happy with the results and would buy again expecting to change the bit before first use.
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