If you want to sharpen chains you will greatly facilitate this tedious task with an adjusting screw. This will be of great help during this type of task, preventing the movement of the chainsaw while working on it.
Specifically, it is a workshop tool also known as a vise, which will provide safety and ease of maneuver during the execution of this action, in addition to high strength.
It is adaptable to different chain sizes and thanks to its pointed shape at one end, you can attach it to any trunk to get the necessary firmness for this work.