cordless drill-driver
Battery-powered portable electric tool used to drill holes and to screw and unscrew.
keyless chuck
Chuck with a regulating ring that automatically tightens the jaws on the tool’s shank.
battery pack
Device that stores chemical energy while charging, then converts it to electric energy.
torque adjustment collar
Ringlike part controlling the tool’s torsion power. Screwing needs lower torque than drilling.
trigger switch
Connection mechanism for starting or stopping the tool by squeezing with the finger.
screwdriver bit
Detachable tool inserted into the chuck and used for screwing and unscrewing.
reversing switch
Switch for selecting the bit’s or drill’s direction of rotation (screwing or unscrewing).
battery pack
Device that stores chemical energy while charging, then converts it to electric energy.
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