Feature:1. 2836 2824 Watch movement mainspring part special designed for watch repairing, suitable for professional use.2. Small and convenient, easy to carry and convenient transportation, exquisite workmanship, no scratching for watch.3. Alloy material is sturdy and not easy to deform, can effectively resist oxidation and rust, long service life.4. One of the professional watch repairing tools, suitable for repairmen and amateurs to save expensive repair costs.5. Special designed for the replacement of watch movement part, easy and convenient for installation and use.Specification:Item Type: Watch Movement MainspringMaterial: Alloy Diameter: Approx. 18mm / 0.7in(manual measurement, please allow a little error)Color: SilverApplicable People: Watch professional maintenance personnelApplication Scenario: Watch movement parts replacement maintenance supplies.Package List:1 x Watch Movement Mainspring (Appearance Random)