This Bergeon 2810 tools unique V-slot design allows you to easily remove rollers from a watch. The V-slot slips between the staff hub and roller seat. Then, if you apply slight pressure to the sides of the tool you will be able to lift the roller from balance seat. These extra fine jaws make this tool even more versatile. It can be used on both small and standard sized watches. Features hand V-slot shape Allows easy removal of watch rollers Can be used on small and standard sized watches Size 3 X 1 X 1″ Inches (75 X 24 X 7mm)