The C-Centering Cutter is an indexable cutter that uses a specialized insert that can start a hole from a solid piece, something extremely difficult to do. It can also perform spot drilling and 90-degree chamfering at the same time or can strictly be used for hole chamfering.
During spot drilling, the insert nose radius can be easily chipped with general cutters since the center has a peripheral speed of zero. The coolant hole in the C-Centering Cutter allows cooling of the cutting edge, which reaches high temperatures during spot drilling, and enables immediate chip evacuation. This prevents chipping during spot drilling.
A benefit of indexable tools is that its life is significantly extended. Once a carbide tool is worn out, there is no other use to it and ends up being thrown away. With an indexable cutter, a small insert can be replaced when worn out, so the cutter body can be reused multiple times.