Do you want to use your hammer drill or combi hammer to drill holes in concrete? Don't forget to put a concrete drill bit on it. Concrete drills are made of very hard material so that they drill the concrete without any problems. The blunt and dull head has a kind of wings, which work like a chisel. In many cases, a concrete drill bit has an SDS connection, because you use them in combination with a drill or combination hammer with an SDS drill head. If you're going to drill in concrete with a drill that isn't intended for this, there is a good chance that you won't even get a millimeter deep.