Impact screwdriver
Impact screwdriver is a very usefull tool. It is dedicated to loosen old or hard screws.
Its internal mechanism transforms the impact of a hammer into a rotation force. Moreover the impact also helps bit to slide from the head.
Having it will save you time especially for mechanic task and rusted assemblies.
But this screwdriver is only intended to loosen screws, it will not replace a conventionnal screwdriver to screw or unscrew. It also only work on conventionnal screw, not for inverted thread.
You can find such type of tool for less than 10$.
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