These drills have a keyless chuck for fast bit changes. A lithium ion (Li–Ion) battery powers these cordless drills, which means they weigh less and have a longer run-time than cordless drills that use nickel cadmium (NiCad) batteries.
Styles A and B have an adjustable clutch that lets you adjust the torque.
Styles B and C have a variable speed—the further you depress the trigger, the faster the drill rotates.
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