Required tools: drill, drills. For drilling in wood it is possible to use helical drills for drilling in metal, however the hole quality is much lower if used wth proper tools for this purpose. It is determined by the fibrous wood texture and it might happen that the helical drill slips from the surface and scratches the material or even makes grooves. In wood drilling three main kinds of drills are used - flat drills, twisted drills, and helical drills. Cutting edges in those drills do not allow for skidding the drill from the hole axis while drilling in hard points in the material, which significantly increases the comfort of work.