Core Bits are the hollow cylindrical tools that are especially designed for the removing of a cylinder of material and the remains left inside of the drill bit is referred to as the core. These are used to make holes through a surface. These are fabricated by using heavy of metal and the drill tips are coated with diamond or carbide to increase the strength and rigidity of the structure. The hollow design of the Core Bits helps to carve out a sample from the drilled material. These are widely used for concrete and hard substances in construction and industrial applications.