wrench:is a tool used to provide a mechanical advantage in applying torque to turn bolts and nuts or other hard-to-turn items
screw:is a shaft with a helical groove or thread formed on its surface and provision at one end to turn the screw
screwdriver:is a device specifically designed to insert and tighten, or to loosen and remove, screws
hammer: is a tool meant to deliver an impact to an object
mallet:is a type of hammer with a head made of softer materials than the steel normally used in hammerheads, so as to avoid damaging a delicate surface
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