SP16001 | Holemaker Pilot Pin 4.73mmx77mm (12-14mm / 25mm DOC) 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 Specifications Diameter: 4.70mm Annular Cutter Depth of Cut: 25mm Overall Length: 77mm