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.Let it be clear: you should use a demolition hammer for breaking or demolishing and no more than that. For light breaking work like removing old joints, but also for heavier demolition duties, a demolition hammer is your best friend. If a demolition hammer has a screw plug, we call it a combi hammer and it can do more than just break. This means you don't only use a Combi hammer for light breaking work, but also to drill holes into concrete or hard types of stone.