This hole saw was a complete disappointment. Based on my observations, it lacked the precision and durability I expect from an industrial and scientific cutting tool. The teeth on the saw quickly became dull and caused the cut to be rugged and uneven. The only positive aspect was that it fits most standard drills. A definite con is that it does not come with a pilot drill bit, which can be frustrating for those who do not have one. Overall, not worth the money.