Based on my observations, this hole saw was a complete letdown. Despite being marketed as an "Industrial and Scientific" tool it failed to meet even basic expectations .The pros were few and far between, but the only redeeming factor was its carbide construction. Unfortunately, THIS sole pro couldn't outweigh the glaring cons. The saw's teeth dulled after a single use and it struggled with even the simplest of tasks. Overall, i would not recommend this product to anyone looking for a reliable hole saw..