A pilot pin serves three main purposes:.
Ejects the slug at the end of the cut.
Provides coolant feed into the centre of the cutter.
Locates the centre of the cut
HOLEMAKER PILOT PIN, 6.34MM x 77MM, TO SUIT 25MM DEPTH OF CUT CUTTERS
Diameter: 6.34mm
Annular Cutter Depth of Cut: 25mm
Overall Length: 77mm