I use my 3/8" cordless Makita drill to install bolts and nuts (and screws) with the adjustable torque setting feature turned up or down as appropriate, mainly because it's a lot faster than installing them by hand and it's also smaller, lighter, and easier to maneuver in tight places than a 1/2" model, corded or cordless. I then tighten the bolt or nut with a wrench or torque wrench.
But for removing bolts and nuts, especially ones that are old or corroded, an impact wrench is the way to go.
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