Patent ID: 7452169

Claim:
A rotary cutting tool for cutting a workpiece such that the dimensions of the workpiece are larger than a substrate to which the workpiece is mounted, comprising: a. a shank portion adapted to be removably retained by a rotating means; b. a cuffing portion having a first and second end, wherein the first end is attached to the shank portion below that part of the shank portion adapted for removably retaining by the rotating means, such that the shank portion and cutting portion are coaxial to one another; c. a bearing connected to the second end of the cutting portion, such that the axis of rotation of the bearing is coaxial with the axis of rotation of the cutting portion; and d. a circular rub collar connected to the peripheral edge of the bearing so that the bearing and rub collar are coaxial and have a common center point, an outer diameter of the rub collar about 0.5 to about 1.0 inch greater than a largest diameter of the cutting portion.