If you're looking for a hole saw kit that can withstand the rigors of industrial plumbing, look no further than this set. Through trial and error, I found that these hole saws are impressively durable, with bi-metal teeth that cut through metal pipes like butter. The variety of sizes allows for versatility and the kit comes with an array of extra blades. While the saws can be a bit pricey, you definitely get what you pay for when it comes to quality.