Feature:1. Watch mainspring winder tools including 20 different model, suitable for most watch mainspring of the market.2. High precise watch mainspring winder design, suitable for professional watch repairing workers to use.3. About 20.5cm / 8.1in of the length, 13.8cm / 5.4in width and 6cm / 2.4in height of the box, perfectly fitment for watch repairing.4. Copper material is corrosion resistant, strong durability, long service life, special designed for watch repairing.5. Wooden box makes the storage become more convenient, keep all the accessories well organized.How to Use:There are different sizes, choose the size of the type you need, prepare the winder ahead of time to keep consistent, and insert the spring into the winder, turn the handle, until the spring is formed and installed. Specification:Item Type: Watch Mainspring WinderMaterial: Copper, Composite WoodLength: Approx. 20.5cm / 8.1inWidth: Approx. 13.8cm / 5.4inHeight: Approx. 6cm / 2.4in(manual measurement, please allow a little error)Applicable Crowd: Applicable watch maintenance professionalsApplication Scenario: Suitable for different size and model of watch mainspring Package List:1 x 8200 Mainspring Winder1 x 2235 Mainspring Winder1 x 7750 Mainspring Winder1 x 8500-1 Mainspring Winder1 x 8500-2 Mainspring Winder1 x 3135 Mainspring Winder1 x 2892 Mainspring Winder1 x 2000 Mainspring Winder1 x c7111 Mainspring Winder1 x 2671 Mainspring Winder1 x L888 Mainspring Winder1 x 1904-1 Mainspring Winder1 x 1904-