Core drilling is a special type of drilling whereby a hole is drilled through a piece of material and a cylindrical section of the material is removed as part of the drilling process. The removed material within the drill is known as the core. Core drilling is normally used to cut through concrete or metal.
The drill bits in a core drill are normally coated in either diamond or carbide. Core drills can cut concrete, cement, wood, metal, rocks and ice. It pushes through the surface with a twisting motion to create the hole. A different drill bit needs to be installed for each surface to allow for the best performance.