This hole saw is an absolute machine! I purchased it for my industrial and scientific work, and it has been able to handle everything I've thrown its way .The bi-metal construction allows me to cut through a variety of materials without worrying about the saw becoming dull or losing its edge. The reliability and efficiency of this hole saw make it a must-have for any workshop. The only con I`ve noticed is that it can be a bit heavy to handle for extended periods of time. Overall a greatβ¦