These drills are the best possible compromise and thus not optimal for all materials. Who a timber. Stone or metal drill needs, should also buy such. Especially in metal these drills are really only a stopgap when no metal drill (for whatever reason) at hand has. Especially handy I find the drill in interior design with half-timbered houses, because you never know what is behind the plaster of a material. So one bit changes at a meeting on timber is no longer necessary. I was positively surprised by the drill without percussion have a good propulsion in brick. For reinforced concrete, however, you should generally take up a titanium drill.
