Based on my experience Bosch`s HB231 2.5 hole saw is a great addition to my tool collection. Its bi-metal construction ensures that it can handle tough materials without overheating or becoming dull quickly. Plus, its EASY-TO-USE design allows for quick and efficient cutting .The only downside is that it's a bit pricier than other hole saws on the market. However, I believe the investment is worth it for a reliable and durable cutting tool. Overall, I highly recommend this product to anyone in the industrial and scientific field..