There are various types of a "power hammer." One such tool is used where a conventional nail gun can't provide the force needed to drive a nail home. Common applications include driving fasteners into concrete. Another example of a power hammer tool is the Bosch rotary power hammer, which features a chipping application, a rotation mode for drilling steel and other building materials, and a hammer/rotator mode for use on stone, concrete, and brick. A different type of foot-powered power hammers are also used in metal forges to replace hand-hammering.