Abstract: A cutter for a surgical drill and/or attachment includes a configured groove section at the proximal end that fits into a clutch mechanism in the drill or attachment. The distal end portion is flattened at above the center line and extends axially a short distance and defines a shoulder with the outer circumference of the shaft of the cutter. A pair of diametrically grooves disposed downstream of the shoulder toward the distal end are formed on the upper and lower portion of the shaft and are oriented in a horizontal plane passing through the center of the flat portion and include in each of the grooves a pair of predetermined angular grooves displaced from the upper circumferential surface with the apex of the angle being in the horizontal plane and another groove adjacent to and upstream of the shoulder toward the proximate end with a predetermined angle with the apex passing through the horizontal plane.