The machine has the same size with Bergeon 5700-Z which made in Switzerlands. It’s normalized diameter (from 12mm to 40mm) is suitable for most watch cases. The commodity includes 2 each of 6 different chucks and 4 pairs of reversible case-holding jaws in special synthetic material. Choosing the applicable jaws before you use the machine, just press the handle and screw when touch the watch back case. The wooden board lay a solid foundation in repairing and testing cases. Also it makes an exquisite model. This is a perfect tool for watchmakers, watch collectors and hobbyist working on watches.