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.

speed selector switch

Device for regulating the chuck’s rotation speed.

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).

charger

Electrical device for recharging the tool’s battery.

battery pack

Device that stores chemical energy while charging, then converts it to electric energy.