A long screwdriver is more powerful than a short one, for the screwdriver is rarely exactly in line with the axis of the screw, but the handle revolves in a circle.

This means an increased leverage, so that the longer the screwdriver, the greater the leverage.
[Illustration: Fig.182.

Pliers.] [Illustration: Fig.183.

Pincers.] [Illustration: Fig.184.

Nippers.] [Illustration: Fig.185.