Abstract: A rotary drill bit insert that includes an elongate body that is rotatable about a central axis wherein the elongate body has a pair of symmetrical halves symmetrical about the central axis. The elongate body contains a central notch disposed between the symmetric halves of the elongate body. Each symmetrical half includes a leading face and a top surface that has a leading surface and a trailing relief surface wherein the leading surface and the trailing relief surface are contiguous and non-coplanar. Each half also has a leading cutting edge at the intersection of the leading face and the leading surface of the top surface. The leading surface is inclined at a constant angle of inclination in a radial direction with respect to a first radial line projecting from the central axis, and the leading surface being inclined downwardly and rearwardly from the leading cutting edge.

Abstract: A headband is disclosed having a U-shaped band constructed of a flexible material, such as metal. The U-shaped band is dimensioned to fit over the head of a user so that the sides of the U-shaped band extend along the sides and behind the ears of the user's head and fictionally, but removably, secure the headband to the user's head. A V-shaped band has two ends that are secured to intermediate points of the U-shaped band so that the V-shaped band extends rearwardly from the U-shaped band and across the top of the head of the user. The hairpiece is then secured to both the U and V-shaped bands so that, with the headband positioned on the user's head, the hair covers areas of balding or partial balding on the user's head.