To measure external measurement

To transfer measurement from steel rule

To measure internal measurement

To mark lines

22 Degree

32 Degree

34.5 Degree

39.5 Degree

To locate the divider point and scribe circles

To punch witness marks

To punch centre marks

To align the drilled holes

Prick punch

Centre punch

Pin punch

Hollow punch

Scaling

Rusting

Pitting

Erosion