Abstract: A rotary cutting tool having a longitudinal body with a rotational axis, comprising a proximal aspect allowing for insertion into an unmotorized or motorized drill, a distal aspect with one or more cutting edges, and two or more fluted segments, among which at least two orientations of fluting are present. A plurality of spacing, shaping, or surfacing may be present between the cutting edge and fluted segments or between fluted segments, and the diameter of the cutting edge may be different than a given point between the distal and proximal aspects of the device.