4-tone drills, which, thanks to the special design of the spiral, leave the R & oacute; wne and smooth edges of the opening and facilitates perpendicular drilling. 4 The blades ensure quick and effective drilling without honing the edge of the opening edge & oacute; spiral spiral significantly accelerates dribbles even to the cheapest species, even the cheapest species to the cheapest species of spiral woody carbon steel (HRC 40-45) Hex hex
