This drill bit was on a whim for making a quick and easy hole in floor tiles for vapor sampling floors on the subject of ecological research. He's been working like a champ and seems to be lagging. Can't comment on longevity as it hasn't been needed since, but it has worked well. It was also bought at a good price, so even if it's never needed again or lasts a long time, it's not a huge loss. Recommended for others with similar expectations and needs as it can serve its purpose well.