Sometimes I end up with a screw or bolt that just doesn't want to come loose and I know if I keep trying with my power driver, I am just going to end up damaging the head to the point where the bit won't bite.In those cases, this tool is just what I need to apply a little persuasion. The impact of the hammer drives the bit into the head at the same time that the rotational torque is applied, helping to keep the bit firmly seated.For those times where that doesn't work, or more likely, where I waited too long to grab the tool and ended up stripping the head, the set also includes a six piece screw extractor set.The materials, fit and finish of all the components seems good, and the blow molded case is nice.Review of KAIFNT K503 Manual Impact Driver/Extractor Set, 1/4-Inch, 24-Piece
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