A torque spanner works in the same way as a ratchet or open-end spanner. Spanners work as a lever to transfer force to bolts or nuts. However, a torque spanner provides a specific force that prevents the bolts or nuts from being damaged. Thanks to a torque spanner, you do not tighten the nut or bolt too hard or too soft. The spanner gives a warning click by means of a spring and a small ball. After this click, the nut or bolt is tightened.