Pros and serious DIYers, listen up: This Milwaukee Ice Hardened hole saw is built to last way longer than the competition. Milwaukee uses a special cryogenic hardening process (they call it \Ice Hardened\) that toughens the metal all the way through, not just on the surface. That means it can last up to 50% longer when cutting through metal, wood, plastic—you name it. This specific size is 3-5/8 inches in diameter (part #49-56-0197). It has a bi-metal Matrix II construction for strength, with a tooth design that cuts fast and clears chips easily. There's even a slot on the side so you can use a screwdriver to pop out the cut plug. Made in the USA, this is a top-tier tool for electricians, plumbers, HVAC techs, or anyone who needs to make clean, precise holes in tough materials. If you're tired of hole saws that dull out too quickly, give this Milwaukee a try. It's an investment that pays off in the long run.