Use an Impact Driver When You Can
An impact driver and a set of high-end hex-shaft nut drivers are all you need to loosen small nuts and bolts. For larger nuts and bolts, you'll need an impact gun and a set of six-point, impact-rated (black finish) sockets. Ordinary chrome sockets can't handle impact work and may crack or shatter under the stress. And because impact-rated sockets have six points instead of 12, they're less likely to round over bolt and nut heads.
Article source here: How to Loosen Nuts, Bolts and Screws
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