18-Volt Brushless Impact Drivers

A brushless tool motor is controlled by a microprocessor, which makes it possible to add features like variable speed/power ranges, automatic downshifting, and advanced protection and diagnostic functions.

Each impact driver was tested with the brand’s highest-capacity battery. For five of the tools, this meant using 3.0-Ah packs like the DeWalt battery shown here. Hilti’s top battery is rated at 3.3 Ah, Milwaukee’s at 4.0 Ah, and Panasonic’s at 4.2 Ah.

Most impact drivers have a single LED light — usually above the trigger, but sometimes on the base. A couple of models have an array of three or four lights around the nose.

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