The Irwin Industrial Tools 3073002 Plumbers set was a total disappointment. Based on my observations, these hole saws were not durable at all and broke easily, causing me to have to purchase replacements within a short period of time. As someone who works in the Industrial and Scientific sector, I expected a higher level of quality for the price I paid. The only pros were that they did cut holes as advertised, but this doesn't make up for the cons of constantly having to replace them. Save your money and invest in a better set of tools.