Industrial and Scientific Bosch HB250 2 1 Bi-Metal Hole saw is simply amazing and it definitely holds up to the Bosch name. This tool can cut through thick metals without any difficulties. Its strong and sharp precision teeth find the right place and dig through easily. The BI-METAL construction also makes it highly durable and long-lasting .The only downside to it is the slightly high price tag, but it is completely worth every penny..