Abstract: A drill bit, the frame of which comprises a front section with protrusions. A set of first rear teeth is arranged at the front section, preferably at the rear part of the protrusions. The set of first rear teeth broadens a drilled hole when the drill is reversed.

Abstract: A method for mounting hard metal buttons in a drill bit and a drill bit. In the method, a hole (4) is worked into a drill (1) before the drill bit is tempered. Subsequently, a hard metal button (3a) surrounded by brazing material is positioned into the hole (4) of the drill bit (1). The assembly is positioned into a tempering space, in which the brazing material spreads around the hard metal button (3a) into a space between the walls of the hole (4) and the hard metal button (3a) under the influence of heat. When the drill bit (1) is cooled after this, the brazing material (5) solidifies, and simultaneously, the body portion (2) of the drill bit (1) having a higher thermal expansion coefficient presses the hard metal button (3a) through the brazing material (5).