PRECISE AND RELIABLE - Installation is very easy as it is secured by a single center screw; rigorously tested for functionality and durability.HIGH QUALITY FEATURES - Retractable hanger; Includes mounting accessories: center screw, used, hand nut (if needed) and 1-2 rubber washers.Design your own watch - using the first-class quartz movement , passionate watch makers will definitely find the accessories they like; it is also suitable for replacing defective movements.Exquisite design: has excellent gears and high-quality brass coils. Excellent gears can extend the service life of the product, which can be as long as 15 years; thickened brass coils can make the watch movement move at a uniform speed.Note: The position of the adjustment button can only be rotated clockwise. If it is rotated counterclockwise, the movement may be easily damaged.