Hole saw for concrete (works like a core drill but can be run smarter with a regular screwdriver) The hole saw has three diamond-coated blades placed so that chips and dust are led away from the saw. Can also be used in concrete with reinforcement. Can be used with a battery-powered screwdriver or with a regular corded drill. Hole saw for dry drilling in concrete up to strength class 30 and in hard-burnt brick. With the unique Drill and drop system, which makes it easy and quick to remove the plug and switch between different sizes.