Pilot Pin 
The pilot pin runs through the centre of an annular cutter, and is designed to serve multiple purpose. 
- Actuates the coolant system when pushed against the workpiece 
- Finds the centre of the hole 
- Ejects the slug at the end of the cut 
SP16003 PILOT PIN, 6.34MM x 77MM, TO SUIT 15-52MM X 25MM DEPTH OF CUT