Feature: 1. 3135 Mainspring special designed for mechanical watch movement repairing. 2. Ensuring normal working and stable performance of mechanical watch movement. 3. Professional mechanical watch repair accessories, give you a satisfactory experience. 4. Suitable for watch makers and watch repairing workers to use, practical and wonderful tool. 5. Wonderful replacement for the old or broken one, made of high quality alloy material. Specification: Condition: 100% Brand New Item Type: 3135 Mainspring Material: Alloy Usage: Used to replace broken or old movement mainspring in watches Model: 3135 Package List: 1 x Mainspring