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The next time you need to drive fat lag screws or loosen large, corroded nuts, retire your ratchet wrench and reach for the DEWALT DC820B Compact Impact Wrench. Driven by an 18 Volt XRP extended-run battery (sold separately), the -1/2 in. -drive, variable-speed wrench delivers both rotation (0-2,400 RPM) and concussive blows (0-2,700 BPM) directly to the fastener. The result is an impressive 1,740 in. -lbs. of turning force.