What is the advantage of an ejector pin of annular cutter?

The ejector pin or also called as pilot pin has 3 major functions:

1. Centring: The ejector pin is exactly positioned to the centre punch mark. Switch the magnet on and the machine and tool are in the drilling position.
2. Oiling: By means of the automatic internal lubrication, cutting oil is supplied via the ejector pin to the bit in just the right quantity.
3. Ejecting: In the final stage, the ejector pin, pre-stressed by means of a spring, pushes the core out of the drill hole.