Thanks to its special spiral flutes, the pen blank drill bit made from M2-HSS allows precise and tear-free drilling - whatever the material. Excellent chip removal prevents the flutes from clogging up and reduces friction. 64 HRC, long edge life and long service intervals, up to 1350 drillings without resharpening. Ideal for turnery work such as boring deep holes in end grain, e.g. in pen making. For softwood, hardwood, plastics and aluminium.