I used it for the concrete wall of the block, but it broke about one for four. The hole diameter is as recommended. I did not enter in the electric screw mode, was it too strong, because it made an impact? It seems necessary to find the optimum condition without sacrifice.
Concrete, mortar As we stick the pipe to the wall, I thought it would be OK if I had not much strength. Easy to use, simply attach a bracket and drill a hole in the hole. I think that the impact is tight until the sound comes out, so it's enough. The mortar wall seems to be stuck in the lower wood board, but it is more secure than a wood screw.