As a loyal customer of Hole Saws & Accessories in Cutting Tools from Industrial and Scientific, I was unhappy with the replacement pilot I tried. As a result of using this product, I found that the performance was subpar and the design was faulty. The only pro was that it was easy to install. However, the cons far outweighed this. The design caused excessive vibration and left unsatisfactory results. I will not be using this product again.