As the name suggests, 16mm diamond core drills can support drill bit sizes up to 16mm. These drills use a keyed chuck system, which means that a chuck tool is required to change the drill bit. 

One benefit of a keyed chuck diamond drill is that other types of drill bits can also be used in this drill if required. 

All diamond core drills are mains powered due to the nature of work they are expected to undertake, such as drilling holes in concrete, stone, and brick.