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.