With the Carat Brilliant EB06642020 diamond core drill bit, you drill clean and accurate holes through concrete, reinforced concrete, and hard natural stone. The specialized segments allow you to start and center smoothly without slipping on hard surfaces. Laser-welded segments ensure maximum durability against weld failure during demanding wet drilling tasks. Featuring a 66 mm diameter, a 400 mm working length, and a 420 mm total length, it easily creates precise penetrations for plumbing, drainage pipes, and hvac conduits across thick walls and floors. The standard 5/4" unc connection fits easily onto compatible professional core drilling rigs, while continuous water cooling keeps the drill cool and efficiently clears away slurry.