I used this in punch mode on my SDS+ punch. I had to drill 3 holes in an 8" wide concrete block that was filled with concrete. The first hole took a long time. I swapped out the bits for the Bosch bits I had after the first hole. I have the next two Holes drilled with a Bosch bit in less time than the first hole with that bit Same perforator Same operator Same concrete block That little bit has to be there.