A tool that uses a hammer like rotary action to release very tight nuts.
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Depends on size of wrench.
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There's a world of difference. A torque wrench is a hand tool used to tighten fasteners to a preset torque specification. An impact wrench is a power tool which uses power actuated hammers to tighten a fastener for high torque applications.
It's called an impact socket, typically distinguishable from other socket types by a matte black color. They're made of a softer metal, in order to prevent the shattering which can occur from using chrome sockets with an impact wrench.
If the nut or bolt is really stuck, the impact will crack a conventional socket.