Core drill

A core drill is a drill specifically designed to remove a cylinder of material.

The material left inside the drill bit is referred to as the core.

Core drills are used for many applications, either where the core needs to be preserved, the drilling apparatus used in obtaining a core sample is often referred to as a corer, or where drilling can be done more rapidly since much less material needs to be removed than with a standard bit. This is why diamond-tipped core drills are commonly used in construction to create holes for pipes, manholes, and other large diameter penetrations in concrete or stone.

A diamond tool is a cutting tool which contains diamond segments for cutting through a wide variety of materials which other cutting tools cannot. The segments are composed of diamond crystals and powder metal which form the bond of the segments.