There are many new releases of hammer drills from all of the large manufacturing companies like Bosch, Makita, DeWalt, Hitachi and Metabo. The reason hammer drills are ranked above other drills in the powertool world is because they can supply more of a punch; this is because of the cylinder and piston system. A piston inside the hammer drill will rotate around whilst in use pushing a large cylinder making a hammer action inside the drill; this is why hammer drills are such powerful machines.