Not yet used. After reading some very bad reviews the first thing I did when I received them was take the pilot bearing off and lubricate it, both pilot bearings came off with no problem. I saw a review where the bits weren't 3 inches long but the ones I got were such I didn't understand how anyone could get a different length. The bit is not as good as a 1/2 inch shank due to vibration and wear. I find it to be ok for light work, not long term use.
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