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2. Impact driver - Wikipedia

   en.wikipedia.org/wiki/Impact_driver

   A manual impact driver (for use with hammer) with screwdriver bits and adapters. An impact driver is a tool that delivers a strong, sudden rotational force and forward thrust. The force can be delivered either by striking with a hammer in the case of manual impact drivers, or mechanically in the case of powered impact drivers.

3. Impact wrench - Wikipedia

   en.wikipedia.org/wiki/Impact_wrench

   Recently, cordless electric impact wrenches have become common, although while their power outputs were initially significantly lower than corded electric or air-powered impact wrenches, the introduction of brushless DC motors and lithium-ion batteries have made cordless impact tools as or even more powerful than air or corded impact wrenches ...

4. Brushless DC electric motor - Wikipedia

   en.wikipedia.org/wiki/Brushless_DC_electric_motor

   Brushless motors are found in many modern cordless tools, including some string trimmers, leaf blowers, saws (circular and reciprocating), and drills/drivers. The weight and efficiency advantages of brushless over brushed motors are more important to handheld, battery-powered tools than to large, stationary tools plugged into an AC outlet.