tommy bar

Noun

 * 1)  A cylindrical iron or steel bar used as a lever; thus:
 * 2) A short bar put through the hole in a socket spanner or box spanner to provide leverage.
 * 3) A bar used to loosen or tighten some types of chucks and tool holders on machine tools such as lathes or milling machines.

Translations

 * Dutch:
 * Greek: αξονίσκος