This part of ISO 7755 specifies the main dimensions of the cutting part for hardmetal burrs of cone shape, with a pointed nose and designated by the symbol M. Tolerances on the cutting diameter, direction of helix and cut, diameter and length of the cylindrical shank and designation of burrs are dealt with in ISO 7755-1.
GSO ISO 7755-11:2013 history
2013GSO ISO 7755-11:2013 Hardmetal burrs -- Part 11: Conical pointed-nose burrs (style M)