SP16004 | Holemaker Pilot Pin 6.34mmx102mm (15-52mm / 50mm 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: 6.34mm Annular Cutter Depth of Cut: 50mm Overall Length: 102mm