Jackhammer
pneumatic tool
A jackhammer is an object used commonly in construction for the purpose of breaking through the ground, or other things.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/3/3f/US_Navy_090818-N-0807W-092_Construction_Electrician_2nd_Class_Eric_Smith_and_Utilitiesman_2nd_Class_Kareen_Vilbrun_break_down_rocks_with_a_jackhammer_during_a_building_renovation.jpg/250px-thumbnail.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/1/13/Digging_in_permafrost.jpg/250px-Digging_in_permafrost.jpg)
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A jackhammer is an object used commonly in construction for the purpose of breaking through the ground, or other things.