The die holder holds the die to make the process of creating threads on a rod of metal easier.
Who uses it and why?
The die holder is used by people who need to extend the threads on a bolt or rod so that it is long enough to complete its function and fits in its slot adequately.
What materials can they be used on?
The die holder is use to hold and spin the die.
How is it used?
The die is placed in the die holder. The rod or bolt is then clamped and the die appropriate size die is placed on it. Then the mechanic will spin the die around the appropriate sized rod and create threads. A tip is used to spin the die and die holder around three times and spin it back once so the excess material does not ruin further threads.
What are the distinctive features?
It has a circle with two metal handles on the end. The appropriate die is placed inside the cylindrical hole until tight. The tool usually comes in a set with dies that will fit in it.