One

Two

Four

Three

To make internal threads in cylindrical jobs

To make external threads in cylindrical jobs

To make internal threads in square jobs

To make external threads in square jobs

No effect threads form normally

Threads forms unevenly

Both die and threads damaged

Pipe broken into pieces

To cut straight slot

To cut internal holes

To cut external curves

To cut internal curves

V notch

Slant notch

Square notch

Straight notch