Features: Professional Watch Mainspring Winder Set with 20 type tool,corrosion resistant copper and housed in a wood storage box, ensures precise winding for most watch types. Engineered for accuracy, this toolkits features ergonomic storage and specializing winder heads suitable for 20 types calibers for seamlessly spring installation. Great for watchmakers, horology technicians, and meticulous watch enthusiasts requiring maintenances solution for luxury timepieces and watches. Suitable for workshops, watch repair station, or home studios for servicing automatic movement, replacing mainsprings, or restoring wristwatches to better performances. The tool set includes a reinforced handle and 20 winder adapters, organized systematically for quick access during intricating repair procedures. Specifications: Product Dimension: Approx. 20.5x13.5x6cm/8.07x2.36x5.31inch Component: Metal, Wood Package Includes: 1 Set Watch Mainspring Winder Kits note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.