Welcome to our store! 1. Adopts premium metal construction, rust-proof and stable 2. Adjustable, the crown winder fits most watch crowns, winding your mechanical watch easily and quickly 3. There are 4 different sizes, you can get a suitable one 4. Can be used when releasing the mainspring when working on mechanical watches 5. Lightweight and handy to carry around due to its small size and light weight Features: Adopts premium metal construction, rust-proof and stable. Adjustable, the crown winder fits most watch crowns, winding your mechanical watch easily and quickly. There are four different sizes, you can get a suitable one. Can be used when releasing the mainspring when working on mechanical watches. Lightweight and handy to carry around due to its small size and light weight. Specifications: Material: Metal Color: Shown as pictures Length: Approx. 8 cm / 3.1 inches Optional Caliber: 3mm / 0.1 inch, 3.5mm / 0.1 inch, 4mm / 0.2 inch, 4.5mm / 0.2 inch Weight: 27 - 28 g Type: Tools & Repair Kits Function: Repair watch, etc Package Includes: 1 x Watch Crown Winder Note: Please note that the new type and old type of this product will be sent randomly, and make sure you don't mind before ordering. Customers are our highest priority. If you find any problems with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best after-sales service.