Irwin make some very nice quarter-inch drive extensions in different lengths that you can use for extending your reach of everything from screwdriver bits, socket drivers and even step drills. I have even stacked the units for getting into really bizarre locations. I have use them for everything from reaching down inside butt stocks to loosen Frozen bolts, to truck firewalls, to holding Spade bits while drilling custom holes for recoil absorbing mercury cylinders, and so forth.
They are not very expensive and are definitely something I would recommend keeping in your toolbox for those times you have to reach something that is set way back.
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