A pneumatic or electro-mechanical tool that combines a hammer directly with a chisel.
Handheld jackhammers are generally powered by compressed air, but some are also powered by electric motors. Larger jackhammers, such as rig-mounted hammers used on construction equipment, are usually hydraulically powered. These tools are typically used to break up rock, pavement, and concrete.
It is known as pneumatic drill or demolition hammer in British English.
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