A rotary cutting tool, having a longitudinal axis about which the rotary cutting tool is rotatable in a direction of rotation, the rotary cutting tool comprising: a cutting portion and a mounting portion extending therefrom, the cutting portion comprising: an end face surface, intersected by the longitudinal axis, and a peripheral surface extending from the end face surface towards the mounting portion, the peripheral surface comprising a plurality of main flutes recessed therein that extend helically about the longitudinal axis; a plurality of end face cutting teeth formed on the end face surface, each end face cutting tooth comprising an end tooth maj or surface that generally faces the direction of rotation, and an end cutting edge formed at the intersection of the end face surface and the end tooth major surface, each end face cutting tooth being defined between circumferentially adjacent end gashes, each of which end gashes interrupts an intersection of the peripheral surface with the end face surface at an associated one of the plurality of main flutes; wherein the end gashes are evenly circumferentially distributed with respect to the main flutes; and in each cross sectional view of the cutting portion, taken perpendicular to the longitudinal axis through the end gashes, an imaginary contour line defined by a peripheral contour of the peripheral surface of one of the end face cutting teeth is in rotationally aligned relationship, about the longitudinal axis, with the peripheral contour of the peripheral surfaces of all other end face cutting teeth; characterized in that: the peripheral surface comprises a plurality of auxiliary flutes recessed therein that extend helically about the longitudinal axis with opposite hand to the plurality of main flutes; and the number of main flutes and auxiliary flutes are different, each being wholly divisible by, and greater than, the number of end face cutting teeth. an end face surface, intersected by the longitudinal axis, and a peripheral surface extending from the end face surface towards the mounting portion, the peripheral surface comprising a plurality of main flutes recessed therein that extend helically about the longitudinal axis; a plurality of end face cutting teeth formed on the end face surface, each end face cutting tooth comprising an end tooth maj or surface that generally faces the direction of rotation, and an end cutting edge formed at the intersection of the end face surface and the end tooth major surface, each end face cutting tooth being defined between circumferentially adjacent end gashes, each of which end gashes interrupts an intersection of the peripheral surface with the end face surface at an associated one of the plurality of main flutes; wherein the end gashes are evenly circumferentially distributed with respect to the main flutes; and in each cross sectional view of the cutting portion, taken perpendicular to the longitudinal axis through the end gashes, an imaginary contour line defined by a peripheral contour of the peripheral surface of one of the end face cutting teeth is in rotationally aligned relationship, about the longitudinal axis, with the peripheral contour of the peripheral surfaces of all other end face cutting teeth; characterized in that: the peripheral surface comprises a plurality of auxiliary flutes recessed therein that extend helically about the longitudinal axis with opposite hand to the plurality of main flutes; and the number of main flutes and auxiliary flutes are different, each being wholly divisible by, and greater than, the number of end face cutting teeth. the end gashes are evenly circumferentially distributed with respect to the main flutes; and in each cross sectional view of the cutting portion, taken perpendicular to the longitudinal axis through the end gashes, an imaginary contour line defined by a peripheral contour of the peripheral surface of one of the end face cutting teeth is in rotationally aligned relationship, about the longitudinal axis, with the peripheral contour of the peripheral surfaces of all other end face cutting teeth; characterized in that: the peripheral surface comprises a plurality of auxiliary flutes recessed therein that extend helically about the longitudinal axis with opposite hand to the plurality of main flutes; and the number of main flutes and auxiliary flutes are different, each being wholly divisible by, and greater than, the number of end face cutting teeth. the peripheral surface comprises a plurality of auxiliary flutes recessed therein that extend helically about the longitudinal axis with opposite hand to the plurality of main flutes; and the number of main flutes and auxiliary flutes are different, each being wholly divisible by, and greater than, the number of end face cutting teeth.