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The DeWalt DCF921B is a compact 20V MAX cordless impact wrench with a 1/2 in. drive and a brushless motor. It is built for automotive and maintenance work where a full-size wrench will not fit, and its variable-speed trigger lets you ease into fasteners instead of hammering them at full power. It is sold as a bare tool, so you need a 20V MAX battery and charger you already own. Against full-size high-torque wrenches it gives up peak breakaway force but wins on size and weight; owners rate it highly for lug nuts and light engine work.
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Lowest price we've seen: $75.99 on Nov 14 at eBay. Tracked across 16 stores since Nov 14.
Owners rate it 4.5 out of 5 and mostly praise the size-to-power balance, calling it a strong compact wrench for lug nuts and engine work. Complaints center on it being a bare tool and on torque limits versus bigger wrenches.
The DEWALT DCF921B ATOMIC is a cordless impact wrench with a 1/2 in. drive. It runs on the 20V MAX battery system and is sold as a tool only, so the battery and charger are not included.
It has a brushless motor, which the store says improves efficiency, durability and runtime. Variable speed control lets the user adjust the tool for the task. The compact ATOMIC body is designed for tight spaces.
It is used for fastening, automotive repair, construction and maintenance work. Use appropriate sockets and safety equipment during operation.














