demolition hammer's force is indicated in joules. The higher the number of joules, the more force the demolition hammer generates. It makes a pretty big difference, you see, whether you want to cut out a narrow slot, or you need to break open a concrete floor. The technology behind every demolition hammer is the same. The head doesn't rotate, but moves back and forth. With this movement, the chisel hammers into the tiles or floor tiles. You won't succeed in drilling a hole with a demolition hammer; it's simply not made for that. A chisel that lands on rock hard floor tiling with massive strength will need to stay firmly in place. This is why a demolition hammer always has an SDS drill head. The chisel gets lodged in there so firmly, it always stays locked in place