I recently purchased an exceptional Industrial and Scientific Drill Bit for my toolbox, and it has taken my drilling to the next level .As my tests showed this bit is extremely durable and was able to bore through difficult materials with ease. The precision of the stepped ALUMINUM design was impressive and made for a smooth and clean cut. the only downside is the higher price point compared to other drill bits, but it's worth it for the quality of this product. Overall, a great investment for any DIY enthusiast or professional..