<p>The drill has a head provided with a cylinder barrel shaped core bit, and a set of teeth provided with different axial teeth heights and alternatingly arranged in a circumferential direction on a distal end of the head, where cutting edges of the teeth are defined at a specific angle with respect to a radial direction. A set of window-type recesses (9) is formed on the cylinder barrel shaped core bit in a tangential direction with respect to the circumferential direction. A transitional area is defined between the head and a shaft (2).</p>
